Crossword Genius

Catch slow mover initially dropping off? (4)

Ross

I believe the answer is:

nail

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'catch' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for nail that I've seen before include "A metal pin or spike" , "Horny covering of the digits" , "Spike, tack" , "Arrest (informal) - fix" , "Perfectly execute" .)

I've seen this clue in The Telegraph.
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