Wife, one attending function with dowager (5)

I believe the answer is:

widow

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

'wife one attending function with' is the wordplay.
'wife' becomes 'w'.
'one' becomes 'i' (Roman numeral).
'attending function' becomes 'do' (I've seen this in other clues. I am not sure about the 'attending' bit.**).
'with' becomes 'w' (abbreviation).
'w'+'i'+'do'+'w'='WIDOW'

Can you help me to learn more?

(Other definitions for widow that I've seen before include "Grass --, divorced woman" , "One left" , "Bereaved" , "See 20" , "One who's husband is dead" .)

I've seen this clue in The Telegraph.

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