Narcotic drug I consumed after work (6)
I believe the answer is:
opiate
'narcotic drug' is the definition.
(I've seen this before)
'i consumed after work' is the wordplay.
'consumed' becomes 'ate' (eating is a kind of consuming).
'after' says to put letters next to each other.
'work' becomes 'op' (abbreviation for opus).
'i'+'ate'='iate'
'iate' after 'op' is 'OPIATE'.
(Other definitions for opiate that I've seen before include "Poppy-derived drug" , "Narcotic drug" , "A sedative drug" , "Drug from poppies" , "Poppy-based drug" .)