Speaker's lines increased (4)
I believe the answer is:
rose
'increased' is the definition.
(rise can mean to increase or go up)
'speaker's lines' is the wordplay.
'speaker's' indicates a 'sounds like' (homophone) clue.
'lines' becomes 'rows' (row is a kind of line).
'rows' sounds like 'ROSE'.
(Other definitions for rose that I've seen before include "Stood" , "increased in price" , "Popular flower" , "Flower - girl - got up" , "Moved upwards for the flower" .)