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Wastrel disliked holding himself back (5)

Ross

I believe the answer is:

idler

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

I can't explain the rest of the clue.

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(Other definitions for idler that I've seen before include "Layabout; ship crewman not on watch" , "One who loafs about" , "bad worker" , "Lazybones; gear wheel" , "Slacker" .)

I've seen this clue in The Irish Times.
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