Greek lovers held hands, piano playing captivating couple at the beginning (7,3,5)
I believe the answer is:
daphnis and chloe
'greek lovers' is the definition.
(lovers in Greek myth)
'held hands piano playing captivating couple at the beginning' is the wordplay.
'playing' is an anagram indicator.
'captivating' indicates putting letters inside (captivate could historically mean to hold captive).
'at the beginning' indicates taking the first letters.
The initial letter of 'couple' is 'c'.
'held'+'hands'+'piano'='heldhandspiano'
'heldhandspiano' with letters rearranged gives 'daphnisandhloe'.
'daphnisandhloe' placed around 'c' is 'DAPHNIS AND CHLOE'.
(Other definitions for daphnis and chloe that I've seen before include "ballet!" , "Rustic lovers" , "Ravel's work" .)