Back out and weep, leaving (3,3)
I believe the answer is:
cry off
'back out' is the definition.
(I've seen this before)
'weep leaving' is the wordplay.
'weep' becomes 'cry' (synonyms).
'leaving' becomes 'off' ('I'm off' means 'I'm leaving').
'cry'+'off'='CRY OFF'
'and' acts as a link.
(Other definitions for cry off that I've seen before include "Pull out" , "Fail to keep an arrangement" , "Scratch" , "Back out (from an agreement)" , "Drop out or withdraw - in tears?" .)