The phrase "a towering cluster" is correct and usable in written English.
It can be used to describe a large, impressive group or collection of things, often in a physical or metaphorical sense.
Example: "The city skyline was dominated by a towering cluster of skyscrapers that reached for the clouds."
Alternatives: "a massive group" or "a grand assembly".
Visitors to Mexico and the U.S. Southwest can't help but stand in awe of the solitary and majestic saguaro, the towering clusters of the organ pipe cactus and Baja's cardón, the appropriately named "elephant" cactus and the largest cactus in the world.
The North Koreans who actually make it to the promised land find themselves in South Korean public housing, towers clustered by the half dozen, living within one-bedroom cookie-cutter apartments, surrounded by fellow defectors.
But the circular dye wells clustered around a towering starburst of date palm trees are now the only surviving example of a trade that reached its peak in Kano.
I was thrilled by Dubai's Burj Khalifa – located as it is in the desert – and the City of London tower cluster seen from the Monument; Canary Wharf is exciting from Greenwich Park, less so from Poplar.
Sprint also lit up their first LTE tower cluster in Kankakee, Illinois of all places, so I'd expect Chicago to taste those high speeds before long, but the other launch markets remain a mystery.
From the river, one sees only a jumble of towers clustered near the edge of Ciudad del Este, and the men on the patrol looked that way with distaste.
It looks less like a single tower than a cluster of towers, an organic formation rather than a self-consciously iconic object.
For years, the Renaissance Center, an otherwise snazzy complex of office towers clustered around a cylindrical Westin (now a Marriott), was the whipping boy for critics of the failures of urban renewal.
And lastly, it may also include sentiment data collected from social media networks that is generated around geo-fenced areas, such as a high-value cell tower clusters around the downtown area of a city, to compare against the network data and the user data.
They are few and very conspicuous: imposing grey-walled structures towering over clusters of old dilapidated homes.
