Militant starts to work on arranged visit (8)
I believe the answer is:
activist
'militant' is the definition.
(synonyms)
'starts to work on arranged visit' is the wordplay.
I cannot quite understand how this works, but
'work' could be 'act' (synonyms) and 'act' is located in the answer.
an anagram of 'visit' is 'ivist' which is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for activist that I've seen before include "Cause promoter" , "forceful person" , "Busy worker for cause" , "Human dynamo" , "Committed campaigner" .)