Rod and line, you say (3)
I believe the answer is:
cue
'rod' is the definition.
(I've seen this before)
'line you say' is the wordplay.
'line' becomes 'queue' (queue is a kind of line).
'you say' indicates a 'sounds like' (homophone) clue.
'queue' sounds like 'CUE'.
'and' is the link.
(Other definitions for cue that I've seen before include "Tapering stick used by snooker player" , "Billiards stick" , "Actor's line to remind another" , "Snooker rod" , "Sign" .)