Lyricist's quest (5)
I believe the answer is:
rhyme
'lyricist's quest' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rhyme that I've seen before include "Word for bird" , "Piece of poetry" , "Poem, eg for nursery" , "Without reason or . . . . . - makes no sense" , "often quoted with reason" .)