Crossword Genius

Fastener, one on tie (6)

Ross

I believe the answer is:

pinion

'tie' is the definition.
(thesaurus)

'fastener one on' is the wordplay.
'fastener' becomes 'pin' (pin is a kind of fastener).
'one' becomes 'i' (Roman numeral).
'pin'+'i'+'on'='PINION'

(Other definitions for pinion that I've seen before include "Wing of a bird" , "Restrain by holding, or bird's wing" , "shackle" , "Cogwheel; seize and secure (arms)" , "Immobilize" .)

I've seen this clue in The Times.
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