Opportunity: vegetable 1p off (4)

I believe the answer is:

turn

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'opportunity' is the definition.
(having a turn means having an opportunity)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for turn that I've seen before include "Rotate - diverge - change" , "Swing round" , "Twist; go" , "Rotate for a performer's act" , "fit" .)

I've seen this clue in The Guardian.

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