A number participating in christenings (3)

I believe the answer is:

ten

'a number' is the definition.
(ten is a number)

'participating in christenings' is the wordplay.
'participating in' says the answer is hidden in the clue.
'TEN' can be found hidden inside 'christenings'.

(Other definitions for ten that I've seen before include "X-WORD" , "Five times two" , "Very young" , "Half a score" , "Dudley Moore/Bo Derek film" .)

I've seen this clue in the Evening Standard.

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