Monkeys about with allowance for divorce (10)
I believe the answer is:
separation
'divorce' is the definition.
(I've seen this before)
'monkeys about with allowance' is the wordplay.
'monkeys' becomes 'apes' (I've seen this in other clues).
'about' says the letters should be written backwards.
'with' says to put letters next to each other.
'allowance' becomes 'ration' (I've seen this before).
'apes' in reverse letter order is 'sepa'.
'sepa'+'ration'='SEPARATION'
'for' is the link.
(Other definitions for separation that I've seen before include "Disunion" , "One is apart (anag)" , "Break-up" , "divorce" , "Split" .)