Crossword Genius

Canal feature; fasten (4)

Ross

I believe the answer is:

lock

I believe this clue is a double definition.

'canal feature' is the first definition.
(I've seen this before)

'fasten' is the second definition.
(I know that lock is a more specific form of the action fasten)

(Other definitions for lock that I've seen before include "element in pack" , "Secure a piece of hair" , "Strand of hair" , "Get stuck in" , "Security device - bit of hair" .)

I've seen this clue in The Times.
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