Perhaps Man lies wantonly (4)

I believe the answer is:

isle

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'perhaps man' is the definition.
'isle' can be an answer for 'man' (I've seen this before). I am not certain of the 'perhaps' bit.

'lies wantonly' is the wordplay.
'lies' anagrams to 'ISLE'.
But, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for isle that I've seen before include "One surrounded by water" , "Man, possibly" , "eg Skye" , "___ of Dogs, Man or Skye" , "Detached place" .)

I've seen this clue in The Mirror.

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