12 across
Gaffer
seen
in
good
sort
of
light
(3)
Gaffer seen in good sort of light (3)
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The definition is at the beginning of the clue.
How the clue works
The definition is Gaffer — your informal boss or governor. For the wordplay, good gives you the abbreviation G, and sort of light points to UV (ultraviolet), and you just put them together.