13 across
Keep
a
big
audience,
say,
on
the
radio
(5)
Keep a big audience, say, on the radio (5)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is keep, meaning to hoard or accumulate. "A big audience, say, on the radio" tells you it's a homophone — a big audience gives you "horde" (a large crowd), which sounds exactly like the answer when spoken aloud.