Crossword Genius

Is it sharper if pricked? (3)

Ross

I believe the answer is:

ear

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'it sharper if pricked?' is the definition.
The definition suggests a singular noun which matches the answer.

I don't understand the remainder of the clue.

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(Other definitions for ear that I've seen before include "Organ of hearing" , "organ with drum" , "Van Gogh missing body part" , "Lughole" , "Lend one and listen" .)

I've seen this clue in The Globe and Mail.
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