Belt is broken in parts (5)

I believe the answer is:

strap

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

'belt' is the definition.
(I've seen this before)

'broken in parts' is the wordplay.
'parts' can be anagrammed to 'STRAP'.
However, I'm not clear how this is indicated.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for strap that I've seen before include "punishment in school" , "e.g. Belt" , "loopy band" , "Parts of a long piece of leather" , "Whip" .)

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

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