Note doctor performs operation in reverse (8)
I believe the answer is:
postcard
'note' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'doctor performs operation in reverse' is the wordplay.
'doctor' becomes 'dr' (abbreviation).
'performs' becomes 'acts' (acting is a kind of performing).
'operation' becomes 'op'.
'in reverse' says the letters should be written in reverse.
'dr'+'acts'+'op'='dractsop'
'dractsop' written backwards gives 'POSTCARD'.
Can you help me to learn more?
(Other definitions for postcard that I've seen before include "Bringer of message" , "Holiday message carrier" , "Holiday greeting" , "Holiday missive" , "Limited communication" .)