Crossword Genius

One finishes sentence? Party time! (3)

Ross

I believe the answer is:

dot

'one finishes sentence?' is the definition.
(as in a full stop)

'party time' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'time' becomes 't' (abbreviation).
'do'+'t'='DOT'

(Other definitions for dot that I've seen before include "Full stop, point" , "Shorter of the two signals used in Morse code" , "Marriage portion; spot" , "Spot, speck" , "Small round spot" .)

I've seen this clue in The Times.
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