Obsessive swimmer cut around island (7)
I believe the answer is:
groupie
'obsessive swimmer' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'cut around island' is the wordplay.
I cannot really see how this works, but
'around' could be 'o' (a round letter) and 'o' is found within the answer.
'island' could be 'i' (geographical abbreviation) and 'i' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for groupie that I've seen before include "Chaser of pop stars" , "Follower of pop singers" , "Devotee" , "Pop star follower" , "Ardent follower of touring pop bands" .)