Crossword Genius

I do it when playing the fool (5)

Ross

I believe the answer is:

idiot

'the fool' is the definition.
(synonyms)

'i do it when playing' is the wordplay.
'when playing' is an anagram indicator.
'do'+'it'='doit'
'doit' with letters rearranged gives 'diot'.
'i'+'diot'='IDIOT'

(Other definitions for idiot that I've seen before include "Twit" , "Fool, silly person" , "Ignoramus's" , "Imbecile" , "Dunce" .)

I've seen this clue in The Guardian and The Globe and Mail.
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