Crossword Genius

Jail sounds hair-raising (4-2)

Ross

I believe the answer is:

lock-up

I'm a little stuck... Click here to teach me more about this clue!

'jail' is the definition.
(I know that jail has the is a more specific form of the action lock up)

'sounds hair-raising' is the wordplay.
I cannot really see how this works, but
'hair' could be 'lock' (a lock of hair) and 'lock' is found in the answer.
The remaining letters 'up' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for lock-up that I've seen is " Shop without living quarters".)

I've seen this clue in The Globe and Mail.
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