Crossword Genius

Important transaction - so what? (3,4)

Ross

I believe the answer is:

big deal

'so what?' is the definition.
(both can express a lack of interest)

'important transaction' is the wordplay.
'important' becomes 'big' (similar in meaning).
'transaction' becomes 'deal' (a deal is a transaction or exchange).
'big'+'deal'='BIG DEAL'

(Other definitions for big deal that I've seen before include "Significant agreement - so what!" , "Scornful response to boast (colloq.)" , "Handing out lots of cards" , "sarcastic response" , "disparaging reply" .)

I've seen this clue in The Daily Express.
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