They're on hand for the restraint of criminals (5)

I believe the answer is:

cuffs

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

'restraint of criminals' is the definition.
'cuffs' can be an answer for 'restraint' (cuffs is a kind of restraint). I am not sure about the 'of criminals' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for cuffs that I've seen before include "Arresting items" , "Sleeve-ends" , "boxes" , "Ends of sleeves" , "Strikes with an open hand" .)

I've seen this clue in the Evening Standard.

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