Crossword Genius

Small fastener for slow mover (5)

Ross

I believe the answer is:

snail

'slow mover' is the definition.
(snails move very slowly)

'small fastener' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'fastener' becomes 'nail' (nail is a kind of fastener).
's'+'nail'='SNAIL'

'for' acts as a link.

(Other definitions for snail that I've seen before include "Not one of the fleet" , "dawdler" , "Edible terrestrial mollusc" , "Slow slithery animal" , "Slow-moving garden pest" .)

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