Acquiesce, needing to conceal incident (5)
I believe the answer is:
scene
'incident' is the definition.
(I know that scene is a type of incident)
'acquiesce needing to conceal' is the wordplay.
'to conceal' says the answer is hidden in the clue.
'SCENE' is hidden in the letters of 'acquiesce needing'.
(Other definitions for scene that I've seen before include "View, landscape" , "Landscape; public display of anger" , "Spectacle" , "bit of an act" , "Landscape - tantrum" .)