Being unprofessional, got rested (3)

I believe the answer is:

lay

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'being unprofessional' is the definition.
(as in a layman)

I can't explain the rest of the clue.

(Other definitions for lay that I've seen before include "Put down (eg, card)" , "Song-ballad" , "Not a religious" , "Not ordained into clergy" , "bed" .)

I've seen this clue in the Evening Standard.

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