Pinch "partir" and go AWL (4,6,5)
I believe the answer is:
take french leave
'pinch partir' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'and go awl' is the wordplay.
I cannot really see how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
'go' could be 'leave' (leaving is a kind of going) and 'leave' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for take french leave that I've seen before include "depart unannounced" , "Disappear without permission" .)