The hat check girl's little hole in the wall (5)
I believe the answer is:
hatch
'girl's little hole in the wall' is the definition.
I can't tell whether this definition defines the answer.
'the hat check' is the wordplay.
'check' becomes 'ch' (abbreviation).
'hat'+'ch'='HATCH'
Can you help me to learn more?
(Other definitions for hatch that I've seen before include "Of young bird or fish, emerge from egg" , "Come up with" , "Movable cover on ship's deck - batten it down" , "Opening in floor or wall" , "Draw fine lines" .)