Get smaller recorder (5)
I believe the answer is:
taper
This clue is a double definition.
'get smaller' is the first definition.
(to taper is to narrow or become smaller)
'recorder' is the second definition.
(I've seen this before)
(Other definitions for taper that I've seen before include "Wind down" , "sticker" , "Get narrower towards end" , "See the light" , "Get thinner towards the end" .)