Crossword Genius

More sober Greek holds party (6)

Ross

I believe the answer is:

graver

'more sober' is the definition.
('grave' can be a synonym of 'sober')

'greek holds party' is the wordplay.
'greek' becomes 'gr'.
'holds' is an insertion indicator.
'party' becomes 'rave' (I've seen this before**).
'gr' placed around 'rave' is 'GRAVER'.

(Another definition for graver that I've seen is " More serious".)

I've seen this clue in The Times.
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