15 down
Source
of
heavy
band
equipment
on
charter
in
southern
county
(9)
Source of heavy band equipment on charter in southern county (9)
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The definition is at the end of the clue.
How the clue works
Right, so southern county is what we're after — Hampshire, down in the south of England. Now for the build: "source of heavy" just means take the first letter of "heavy", giving you H. Stick AMPS on after that for the "band equipment" bit, then finish with HIRE for "charter", and H, AMPS, HIRE slots together nicely.