The courage to keep harping? (5)

I believe the answer is:

pluck

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'the courage' is the definition.
(pluck is a kind of courage)

I cannot understand how the rest of the clue works.

(Other definitions for pluck that I've seen before include "Play a guitar - prepare a chicken for the pot" , "Nerve" , "Pull a guitar string - courage" , "Gather" , "Daring" .)

I've seen this clue in the Evening Standard.

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