Slow down and pause, say (5)
I believe the answer is:
brake
'slow down' is the definition.
(I've seen this before)
'pause say' is the wordplay.
'pause' becomes 'break' (break is a kind of pause).
'say' shows a homophone (sound like).
'break' is a homophone of 'BRAKE'.
'and' is the link.
(Other definitions for brake that I've seen before include "Decelerate" , "Cause to slow down" , "Thicket; fern; slow down" , "Slower" , "Restraint on vehicle" .)