Flower found in lines, say (4)
I believe the answer is:
rose
'flower' is the definition.
(I know that rose is a type of flower)
'lines say' is the wordplay.
'lines' becomes 'rows' (row is a kind of line).
'say' indicates a 'sounds like' (homophone) clue.
'rows' is a homophone of 'ROSE'.
'found in' acts as a link.
(Other definitions for rose that I've seen before include "Adjourned" , "Flower - ascended" , "Old song 'The last . . . of summer'" , "increased in price" , "moved from seat?" .)