The phrase "a gap left" is correct and usable in written English.
It can be used to describe an empty space or a void that remains after something has been removed or completed.
Example: "After the old building was demolished, there was a noticeable gap left in the skyline."
Alternatives: "an empty space" or "a void remaining".
MSF has five field hospitals in west Africa, plugging a gap left by the fragile health care systems.
If needed, they could start filling a gap left by the foundation as soon as January, Barry said.
He could provide much-needed support for Fernando Torres or fill a gap left by Yossi Benayoun's transfer to Chelsea.
Customized ceremonies are an attempt to fill a gap left by the Communist Party's 70-year war against religion and bourgeois traditions.
The new Islamism filled a gap left by the near-collapse of local and federal services, from road upkeep to education, at a time of dreadful mismanagement.
The army and police have stepped in to fill a gap left by G4S, a contractor which failed to provide enough security staff.
In the Sanghar district where Samina's village is located, at least 400 Marvis fill a gap left by a lack of government funded lady health workers (LHWs).
Are our soldiers also supposed to serve as the village internal-affairs departments, filling a gap left by our tolerance of higher-level corruption?
Free papers, rather than stealing market share in Spain, have been converting nonreaders into readers, filling a gap left by the lack of Spanish tabloids.
Critics claim the premium is only going some way to fill a gap left by cuts elsewhere in the schools budget.
He praised them for filling a gap left by America's big newspapers, many of which are shrinking in size and facing unprecedented financial challenges.
