Fix the telly? (3)
I believe the answer is:
set
This clue is a double definition.
'fix' is the first definition.
(synonyms)
'telly?' is the second definition.
(telly is a kind of set)
'the' acts as a link.
(Other definitions for set that I've seen before include "Create a puzzle" , "Place - become rigid - adjust - group of tennis games - fixed - clique - fall beneath the horizon" , "Solidify like jelly" , "Determined or congealed" , "Scenery etc. for the stage" .)