Turn back and take drugs (3-3)
I believe the answer is:
dog-ear
'turn back' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'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'
'and' is the link.
Can you help me to learn more?
(Other definitions for dog-ear that I've seen before include "Hint of shabbiness" , "Turned-over page corner" , "Fold down a corner (of a page)" , "Fold on page's corner" , "Corner of a page turned down to mark your place" .)