Crossword Genius

Put on party attended by any number (3)

Ross

I believe the answer is:

don

'put on' is the definition.
(as in donning or putting on an item of clothing)

'party attended by any number' is the wordplay.
'party' becomes 'do' (do is a kind of party).
'attended by' is a charade indicator (letters next to each other).
'any number' becomes 'n' (mathematical symbol for an unspecified number).
'do'+'n'='DON'

(Other definitions for don that I've seen before include "Spanish gent or Mafia chief" , "A mafia chief or Spanish grandee" , "Get into" , "Bradman, the ---" , "Spanish male title" .)

I've seen this clue in The Times.
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