Crossword Genius

In essence, cash for a woman (7)

Ross

I believe the answer is:

summary

I'm a little stuck... Click here to teach me more about this clue!

'in essence' is the definition.
'summary' can be an answer for 'essence' (thesaurus). I am not certain of the 'in' bit.

'cash for a woman' is the wordplay.
'cash for' becomes 'sum' (I can't justify this - if you can you should believe this answer much more).
'a woman' becomes 'Mary' (woman's name).
'sum'+'mary'='SUMMARY'

Can you help me to learn more?

(Other definitions for summary that I've seen before include "Arbitrary" , "Synopsis, outline" , "Abstract, short version" , "Abridgment" , "Immediate" .)

I've seen this clue in the Evening Standard.
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