Crossword Genius

Old man takes drug when heading to adult parties extremely late (4,2,1,4)

Ross

I believe the answer is:

dead as a dodo

I'm a little stuck... Click here to teach me more about this clue!

'old' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'man takes drug when heading to adult parties extremely late' is the wordplay.
I cannot quite see how this works, but
'man' could be 'odo' and 'odo' is found within the answer.
'drug' could be 'e' (E is another name for ecstasy) and 'e' is located in the answer.
'when' could be 'as' (eg 'when I walked' means 'as I walked') and 'as' is located in the answer.
'adult' could be 'da' (D.A. is an example) and 'da' is found within the answer.
'late' could be 'd' and 'd' is found in the answer.
The remaining letters 'ad' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for dead as a dodo that I've seen before include "Quite out of date" , "Completely lifeless" , "Utterly finished" , "native of Mauritius" , "of no interest now" .)

I've seen this clue in The Independent.
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