Crossword Genius

Trousers round ankles possibly set bells off (8)

Ross

I believe the answer is:

beltless

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

'trousers round ankles' is the definition.
I can't tell whether this defines the answer.

'set bells off' is the wordplay.
'off' indicates anagramming the letters.
'set'+'bells'='setbells'
'setbells' anagrammed gives 'BELTLESS'.

'possibly' acts as a link.

Can you help me to learn more?

(Another definition for beltless that I've seen is " Without a band".)

I've seen this clue in The Independent.
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