Possibly restless peelers? (7)

I believe the answer is:

sleeper

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'possibly' is the definition.
The answer and definition are not the same part of speech.

'restless peelers?' is the wordplay.
'restless' is an anagram indicator (letters not resting).
'peelers' anagrammed gives 'SLEEPER'.

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(Other definitions for sleeper that I've seen before include "Unactivated spy - railway support" , "Rip Van Winkle" , "One who slumbers" , "Support for railway lines" , "someone who is out" .)

I've seen this clue in the Evening Standard.

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