Crossword Genius

Revel losing head a little bit (4)

Ross

I believe the answer is:

iota

'little bit' is the definition.
(thesaurus)

'revel losing head a' is the wordplay.
'revel' becomes 'riot' (riot is a kind of revel).
'losing head' means to remove the first letter.
'riot' with its first letter removed is 'iot'.
'iot'+'a'='IOTA'

(Other definitions for iota that I've seen before include "Greek letter - minimal amount" , "Hint" , "Tiny piece" , "Just a jot, from Greek alphabet" , "little part" .)

I've seen this clue in The Telegraph.
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