Crossword Genius

Secure hair (4)

Ross

I believe the answer is:

lock

I believe this is a double definition.

'secure' is the first definition.
(locking is a kind of securing)

'hair' is the second definition.
(lock is a kind of hair)

(Other definitions for lock that I've seen before include "Hold < wisp of wool" , "Bolt" , "part of 10 [CANAL]" , "Become immoveable" , "Security or navigational device" .)

I've seen this clue in The Telegraph.
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