Kind of drug I consumed after work (6)
I believe the answer is:
opiate
'kind of drug' is the definition.
'i consumed after work' is the wordplay.
'consumed' becomes 'ate' (eating is a kind of consuming).
'after' means one lot of letters go next to another.
'work' becomes 'op' (abbreviation for opus).
'i'+'ate'='iate'
'iate' put after 'op' is 'OPIATE'.
(Other definitions for opiate that I've seen before include "Drug with an opium base" , "one soporific" , "dope" , "Type of drug" , "A poet I become on this drug" .)