Many a happy ending comes in time (3)

I believe the answer is:

day

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'in time' is the definition.
'day' can be an answer for 'time' (thesaurus). I'm unsure of the 'in' bit.

'many a happy ending' is the wordplay.
'many' becomes 'd' (Roman numeral for 500).
'ending' says to take the final letters (the ending of the word).
The final letter of 'happy' is 'y'.
'd'+'a'+'y'='DAY'

'comes' is the link.

Can you help me to learn more?

(Other definitions for day that I've seen before include "24 hour period" , "Particular date" , "THIRD PART OF 23" , "24-hour period" , "Lewis as poet" .)

I've seen this clue in the Evening Standard.

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