Sick expected fudge (6)
I believe the answer is:
parrot
'sick expected fudge' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Maybe you can see an association between them that I don't see?
'expected fudge' is the wordplay.
'expected' becomes 'par' (as in 'par for the course').
'fudge' becomes 'rot' (I am not sure about this - if you are sure you should believe this answer much more).
'par'+'rot'='PARROT'
Can you help me to learn more?
(Other definitions for parrot that I've seen before include "Eg, macaw" , "Repeat automatically" , "Unintelligent imitator" , "Psittacine bird" , "Tropical bird, may talk" .)