Mischief-maker simply hides (3)

I believe the answer is:

imp

'mischief-maker' is the definition.
(thesaurus)

'simply hides' is the wordplay.
'hides' indicates a hidden word.
'IMP' can be found hidden inside 'simply'.

(Other definitions for imp that I've seen before include "A mischievous little devil" , "Rascal" , "Evil spirit" , "Scallywag" , "Elf" .)

I've seen this clue in The Times.

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