Crossword Genius

Drank foolishly after a lot of narcotic, did one? (8)

Ross

I believe the answer is:

drunkard

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

'narcotic did one?' is the definition.
I can't judge whether this definition defines the answer.

'drank foolishly after a lot' is the wordplay.
'foolishly' indicates anagramming the letters.
'after' says to put letters next to each other.
'a lot' becomes 'dru' (I can't justify this - if you can you should give a lot more credence to this answer).
'drank' with letters rearranged gives 'nkard'.
'nkard' put after 'dru' is 'DRUNKARD'.

'of' is the link.

Can you help me to learn more?

(Other definitions for drunkard that I've seen before include "alkie" , "boozer" , "Alcoholic" , "Toper, sot, lush" , "One regularly intoxicated" .)

I've seen this clue in The Times.
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