Broad's all gob, possibly (6)
I believe the answer is:
'broad's' is the definition.
('global' can be a synonym of 'broad')
'all gob possibly' is the wordplay.
'possibly' indicates an anagram.
'allgob' is an anagram of 'GLOBAL'.
(Other definitions for global that I've seen before include "Of the whole world, worldwide" , "Relating to the whole world" , "Shaped like a sphere or ball" , "Across our planet" , "Across the world" .)