Crossword Genius

Hastily fasten bridle, etc (4)

Ross

I believe the answer is:

tack

I believe this is a double definition.

'hastily fasten' is the first definition.
(tack can mean to fasten quickly or temporarily)

'bridle etc' is the second definition.
(I know that bridle is a type of headgear)

(Other definitions for tack that I've seen before include "Staple - food" , "Nail; course of action" , "(Of a sailing ship) alter course through the wind" , "Stable gear" , "Nail - windward course - temporary stitch" .)

I've seen this clue in The Telegraph.
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