Bro's new sphere (3)
I believe the answer is:
orb
'sphere' is the definition.
(I know that orb is a type of sphere)
'bro's new' is the wordplay.
'new' is an anagram indicator.
'bro' anagrammed gives 'ORB'.
(Other definitions for orb that I've seen before include "Sovereign artefact" , "Item of insignia" , "A poetic eye, bro" , "Ornamental sphere" , "Sphere - eye" .)