Crossword Genius

Not be straight in driving a bargain? (5,3,4)

Ross

I believe the answer is:

wheel and deal

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

'not be straight in driving' is the definition.
I can't judge whether this definition defines the answer.

'a bargain?' is the wordplay.
I cannot quite understand how this works, but
'a' could be 'an' and 'an' is present in the answer.
'bargain?' could be 'deal' (synonyms) and 'deal' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for wheel and deal that I've seen before include "Engineer" , "Engage in unscrupulous commerce" , "Engage in shrewd bargaining to advance one's own interests" , "be an operator" .)

I've seen this clue in The Guardian.
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