Ask earnestly for new net rate (7)
I believe the answer is:
entreat
'ask earnestly for' is the definition.
(I've seen this before)
'new net rate' is the wordplay.
'new' is an anagram indicator.
'net'+'rate'='netrate'
'netrate' with letters rearranged gives 'ENTREAT'.
(Other definitions for entreat that I've seen before include "Pray" , "Beg earnestly, appeal" , "Sue" , "go begging?" , "Request earnestly" .)