Crossword Genius

I seem most dishevelled on occasion (9)

Ross

I believe the answer is:

sometimes

'on occasion' is the definition.
(I've seen this before)

'i seem most dishevelled' is the wordplay.
'dishevelled' is an anagram indicator.
'i'+'seem'+'most'='iseemmost'
'iseemmost' with letters rearranged gives 'SOMETIMES'.

(Other definitions for sometimes that I've seen before include "Occasionally available" , "On occasion" , "Not always" , "Seem moist (anag.)" .)

I've seen this clue in The Independent.
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