Traditionally it is applied to the back parts (5)

I believe the answer is:

strap

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'traditionally it is applied' is the definition.
I can't tell whether this definition defines the answer.

'the back parts' is the wordplay.
'the back' is a reversal indicator.
'parts' reversed gives 'STRAP'.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for strap that I've seen before include "Whip" , "Secure" , "Fasten; punishment" , "Parts of a leather band" , "Leather fastener" .)

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

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