Go away and cry when one's bottom is pinched (5)
I believe the answer is:
scram
'go away' is the definition.
(scramming is a kind of going away)
'cry when one's bottom is pinched' is the wordplay.
I cannot quite see how this works, but
'one's' could be 'am' ('one is' can humorously mean 'I am') and 'am' is found in the answer.
The remaining letters 'scr' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'and' acts as a link.
Can you help me to learn more?
(Other definitions for scram that I've seen before include "Leave quickly" , "In slang, go away and beat it" , "Leave hurriedly" , "Scarper" , "Clear off!" .)