A couple of characters from Arsenal, possibly at Wembley (5)
I believe the answer is:
arena
'wembley' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?
'a couple of characters from arsenal possibly' is the wordplay.
'a couple of characters' means two replacements for 'character'.
'character' becomes 'a'.
'character' becomes 'a'.
'from' is a deletion indicator.
'arsenal' becomes 'RA' (Royal Artillery).
'possibly' becomes 'ena' (I can't explain this - if you can you should give a lot more credence to this answer).
'ra' with 'a' taken away is 'r'.
'a'+'r'+'ena'='ARENA'
'at' acts as a link.
Can you help me to learn more?
(Other definitions for arena that I've seen before include "Sports or entertainment venue" , "Stadium - battlefield" , "bowl? Possibly" , "Gladiatorial ring" , "Show ring" .)