Some frolic or fun on a Greek island (5)
I believe the answer is:
corfu
'a greek island' is the definition.
(Corfu is a Greek island)
'some frolic or fun' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'CORFU' is hidden in the letters of 'frolic or fun'.
'on' is the link.
(Other definitions for corfu that I've seen before include "Kerkira, Ionian island" , "Holiday location" , "Greek holiday island" , "holiday venue!" , "Ionian holiday island" .)