Dependent on drugs, did cadet collapse? (8)
I believe the answer is:
addicted
'dependent on drugs' is the definition.
(I've seen this before)
'did cadet collapse?' is the wordplay.
'collapse?' is an anagram indicator (I've seen 'collapses' mean this).
'did'+'cadet'='didcadet'
'didcadet' anagrammed gives 'ADDICTED'.
(Other definitions for addicted that I've seen before include "Seriously devoted (to a particular activity)" , "Drug-dependent" , "Hooked compulsively as by drugs" , "Cadet did become compelled to use harmful substance (8)" , "Dependent on something habit-forming" .)