Cooperate, using influence to pay back that woman (4,8)
I believe the answer is:
pull together
'cooperate' is the definition.
(thesaurus)
'using influence to pay back that woman' is the wordplay.
'using influence' becomes 'pull' (I can't justify this - if you can you should give a lot more credence to this answer).
'pay back' becomes 'get' ('get' can be a synonym of 'pay back').
'that woman' becomes 'her' (I've seen this before).
'pull'+'to'+'get'+'her'='PULL TOGETHER'
Can you help me to learn more?
(Another definition for pull together that I've seen is " Co-operate (at tug-of-war?)".)