Crossword Genius

Local infirm person cut from The Snapper (4)

Ross

I believe the answer is:

croc

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'snapper' is the definition.
(an animal which 'snaps')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for croc that I've seen before include "Snapper" , "Fierce beast" , "Large, bony-plated reptile (abbr)" , "Small reptile" , "creature heard to be a vicious one" .)

I've seen this clue in The Irish Times.
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