Crossword Genius

Wind blows at 3mph — that should be a breeze (5,3,7)

Ross

I believe the answer is:

whats the problem

'that should be a breeze' is the definition.
(phrase used to say something should be simple)

'wind blows at 3mph' is the wordplay.
I cannot really see how this works, but
'at' is within the answer.
This may be the basis of the clue (or it may be nonsense).

I've seen this clue in The Guardian.
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