One might revisit this corner to take drugs (3-3)
I believe the answer is:
dog-ear
'one might revisit this corner' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'take drugs' is the wordplay.
'take' becomes 'do' (eg taking or doing drugs).
'drugs' becomes 'gear' (gear can informally mean illegal drugs).
'do'+'gear'='DOG-EAR'
'to' is the link.
Can you help me to learn more?
(Other definitions for dog-ear that I've seen before include "Corner of a page turned down to mark your place" , "Fold on page's corner" , "Hint of shabbiness" , "Turned-over page corner" , "Crease in book page like canine appendage" .)