Part of a key chain? (5)
I believe the answer is:
islet
'part of a key chain?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for islet that I've seen before include "Cay, for example" , "Stile (anag)" , "Tiles (anag.)" , "Small landmass" , "Eyot, key" .)