Volunteer work leads to it never ending (5)
I believe the answer is:
opine
'volunteer' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Perhaps you can see an association between them that I can't see?
'work leads to it never ending' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'leads to' indicates taking the first letters.
The first letters of 'it never ending' is 'ine'.
'op'+'ine'='OPINE'
Can you help me to learn more?
(Other definitions for opine that I've seen before include "Suggest" , "Express one's opinion openly" , "Give one's view" , "Give opinion" , "State as one's opinion" .)