Having been stopped by spies, revolutionary on a list reluctant to join party (10)
I believe the answer is:
antisocial
'having been stopped by spies revolutionary on a list reluctant' is the definition.
I can't tell whether this defines the answer.
'join party' is the wordplay.
'join' becomes 'anti' (I can't explain this - if you can you should give a lot more credence to this answer).
'party' becomes 'social' (social can mean a party or event).
'anti'+'social'='ANTISOCIAL'
'to' is the link.
Can you help me to learn more?
(Other definitions for antisocial that I've seen before include "Avoiding the company of others" , "Disruptive to the community" , "Disinclined to mix" , "withdrawn" , "Not getting on with others" .)