"constituent in" is a correct and usable phrase in written English.
It is used to refer to a part of a whole, for example "The employees are a constituent in the company's success".
(Magnesia, for example, is a common constituent in refractory ceramics).
He talks about constituent in a cleaning service who pays a living wage to employees.
Toll House cookies were a common constituent in care packages shipped to American soldiers overseas.
In Puglia, for example, chardonnay is a major constituent in the white version of Salice Salentino.
The bill's 13 co-sponsors include every representative who lost a constituent in the embassy attacks, Mr. Blunt noted.
Had Mills been checking emails about a constituent in hospital we would have applauded his multi-tasking.
It's a prime constituent in Champagne, of course, where it is vinified as a white wine, but there is more.
One supplement, L-theanine, a natural constituent in green tea, is claimed to neutralise the jittery side-effects of caffeine.
The monohydrate form of sodium carbonate, Na2CO3·H2O, is employed extensively in photography as a constituent in developers.
Zinc chloride has applications in the textile industry and as a flux constituent in soldering, aluminum refining, and galvanizing.
I ask if anything in acting can beat taking on Blair in the Commons or helping a constituent in dire need.
