Crossword Genius

Part of contra deal? (5)

Ross

I believe the answer is:

trade

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

'part' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'of contra deal?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'TRADE' is hidden in the letters of 'contra deal'.

Can you help me to learn more?

(Other definitions for trade that I've seen before include "Transaction" , "Dealing in goods" , "Commercial dealings" , "Buying/selling of goods" , "Calling" .)

I've seen this clue in the Sydney Morning Herald.
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