Bloke seen in good sort of light (3)
I believe the answer is:
'bloke' is the definition.
(both can informally refer to a man)
'good sort of light' is the wordplay.
'good' becomes 'g' (abbreviation).
'sort of light' becomes 'UV' (ultraviolet light).
'seen in' is the link.
(Other definitions for guv that I've seen before include "Sir" , "Boss (inf.)" .)