Steal fruitfully (6)

I believe the answer is:

scrump

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'steal' is the definition.
Both the answer and definition are verbs in their base form.
Maybe there's a link between them I don't understand?

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

Can you help me to learn more?

(Other definitions for scrump that I've seen before include "Steal (fruit) from an orchard" , "theft" , "Steal apples from trees" , "steal from farmer" , "Nick apples" .)

I've seen this clue in the Evening Standard.

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