Gold to stick on speaker's aid (7)
I believe the answer is:
autocue
'speaker's aid' is the definition.
(I've seen this before)
'gold to stick on' is the wordplay.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'stick' becomes 'cue' (I've seen this before).
'on' is a charade indicator (letters next to each other).
'au'+'to'+'cue'='AUTOCUE'
(Other definitions for autocue that I've seen before include "TV prompter" , "Prompting device for a speaker" , "TV prompt device" , "Speaker's prompt device" , "Newsreader's prompt" .)