Take expert correspondence for ultimate gain (3,6)
I believe the answer is:
net profit
'take expert correspondence' is the definition.
'net profit' can be an answer for 'take' (thesaurus). I'm not sure about the 'expert correspondence' bit.
'ultimate gain' is the wordplay.
'ultimate' becomes 'net' (similar in meaning).
'gain' becomes 'profit' (synonyms).
'net'+'profit'='NET PROFIT'
'for' is the link.
Can you help me to learn more?
(Other definitions for net profit that I've seen before include "Earnings after all deductions" , "What's finally made" , "Actual money to be made" , "Excess of sales over costs for potent fir" , "return from business" .)