Handicap handily (7)

I believe the answer is:

manacle

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'handicap handily' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

This is all the clue.

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(Other definitions for manacle that I've seen before include "Handcuff" , "Curb" , "Shackle on the wrist" , "Fetter" , "restricting at the cuff?" .)

I've seen this clue in the Evening Standard.

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