Couple running round island in judge's wake (4)
I believe the answer is:
join
'couple' is the definition.
(I've seen this in another clue)
'running round island in judge's wake' is the wordplay.
I cannot quite understand how this works, but
'round' could be 'o' (round can mean a round object) and 'o' is found in the answer.
'island' could be 'i' and 'i' is found within the answer.
'judge' could be 'j' (abbreviation for judge) and 'j' is present in the answer.
A single letter 'n' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for join that I've seen before include "Become a member" , "Link, unite" , "Amalgamate" , "Audibly" , "Couple" .)