Undertakes to distribute grease (6)
I believe the answer is:
agrees
'undertakes' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their -s form.
Perhaps you can see a link between them that I can't see?
'distribute grease' is the wordplay.
'distribute' indicates an anagram (I've seen this in other clues).
'grease' anagrammed gives 'AGREES'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for agrees that I've seen before include "is in accord" , "Grease (anag.)" , "Assents, concurs" , "Is of one mind" , "Holds the same opinion" .)