Some suitably rich lines (5)
I believe the answer is:
lyric
'lines' is the definition.
(I have seen 'Poetic lines' mean 'lyric' so perhaps 'lines' could also mean 'lyric')
'some suitably rich' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'LYRIC' is hidden in the letters of 'suitably rich'.
(Other definitions for lyric that I've seen before include "part of song" , "A song or poem" , "Text of a popular song" , "Poetic lines" , "in musical" .)