One comparatively unused to work (5)

I believe the answer is:

idler

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'one comparatively' is the definition.
I can't judge whether this definition defines the answer.

'unused to work' is the wordplay.
'unused' becomes 'idle' (synonyms).
'to work' becomes 'r' (I can't explain this - if you can you should believe this answer much more).
'idle'+'r'='IDLER'

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(Other definitions for idler that I've seen before include "Work-shy individual" , "One reluctant to work" , "Johnson's work" , "Couch potato" , "Long doleful cry" .)

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

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