Globes of gold, boron and sulphur (4)
I believe the answer is:
orbs
'globes' is the definition.
(both can mean spheres)
'gold boron and sulphur' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'boron' becomes 'B' (synonyms).
'and' means one lot of letters go next to another.
'sulphur' becomes 'S' (synonyms).
'or'+'b'+'s'='ORBS'
'of' is the link.
(Other definitions for orbs that I've seen before include "Round objects" , "Spherical objects" , "Jewelled spheres" , "Nices eyes, bros" , "circles" .)