Shimmer of gold, initially — pay attention (7)
I believe the answer is:
glisten
'shimmer' is the definition.
(thesaurus)
'gold initially pay attention' is the wordplay.
'initially' says to take the initial letters.
'pay attention' becomes 'listen' (I've seen this before).
The initial letter of 'gold' is 'g'.
'g'+'listen'='GLISTEN'
'of' acts as a link.
(Other definitions for glisten that I've seen before include "Shine like something wet" , "Shine with reflected light" , "Be a shining example" , "Glow from reflection" , "Shine or sparkle wetly" .)