A light entertainer initially mobbed by press in a flap (7)
I believe the answer is:
aileron
'flap' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for aileron that I've seen before include "An oriel (anag.); plane part" , "Movable wing surface" , "Movable part of an aircraft's wing" , "Hinged part of a plane's wing" , "Movable part of an aircraft wing" .)