Source of inspiration moderator reveals (5)

I believe the answer is:

erato

'source of inspiration' is the definition.
(one of the muses in Greek myth)

'moderator reveals' is the wordplay.
'reveals' indicates the answer is hidden within the clue.
'ERATO' can be found hidden inside 'moderator'.

(Other definitions for erato that I've seen before include "poetical inspiration" , "daughter of Zeus" , "Muse of 11 and 23" , "One of nine" , "Greek muse of lyric and love poetry" .)

I've seen this clue in The Times.

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