Have sex, possibly, and get away (4,2)
I believe the answer is:
beat it
'get away' is the definition.
('beat it!' means get away)
'have sex possibly' is the wordplay.
I cannot quite understand how this works, but
'have' could be 'eat' (have can mean to eat or consume) and 'eat' is located in the answer.
'sex' could be 'it' (common euphemism) and 'it' is found within the answer.
A single letter 'b' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'and' is the link.
Can you help me to learn more?
(Other definitions for beat it that I've seen before include "make off furtively" , "Slang order to go away, get lost" , "Scram, get lost" , "Scram, take a powder" , "Sling your hook!" .)