Crossword Genius

Great trade? Who cares (3,4)

Ross

I believe the answer is:

big deal

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'cares' is the definition.
The definition and answer are not the same part of speech.

'great trade?' is the wordplay.
'great' becomes 'big' (synonyms).
'trade?' becomes 'deal' ('deal' can be a synonym of 'trade').
'big'+'deal'='BIG DEAL'

'who' is the link.

Can you help me to learn more?

(Other definitions for big deal that I've seen before include "Exclamation of scorn, belittling a claim" , "Scornful response to boast (colloq.)" , "doesn't impress me at all" , "Significant agreement - so what!" , "Potential slam hand at bridge" .)

I've seen this clue in The Sun.
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