Sort of pulley not working right? (5)

I believe the answer is:

idler

'sort of pulley' is the definition.

'not working right?' is the wordplay.
'not working' becomes 'idle' (I've seen this before).
'right?' becomes 'r' (common abbreviation).
'idle'+'r'='IDLER'

(Other definitions for idler that I've seen before include "one averse to work" , "Lazy person" , "comparatively slack" , "Bummer" , "Riled (anag)" .)

I've seen this clue in The Times.

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