Raised help in measure to negotiate (7)
I believe the answer is:
mediate
'to negotiate' is the definition.
(mediating is a kind of negotiating)
'raised help in measure' is the wordplay.
I cannot really understand how this works, but
'measure' could be 'at' (at is a kind of measure) and 'at' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for mediate that I've seen before include "Act as intermediary" , "Arbitrate between parties in dispute" , "Act as middle man" , "Conciliate" , "Help resolve a dispute" .)