22 across
Old
man’s
taken
to
island,
15
by
the
sound
of
it?
(6)
Old man’s taken to island, 15 by the sound of it? (6)
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The definition is at the end of the clue.
How the clue works
The definition is 15 by the sound of it?, where 15 is a cross-reference to 15 across (JAMAICA) — patois is the dialect or speech of Jamaica, so it is what Jamaica sounds like. The wordplay builds PA (old man) + TO (taken to) + IS (island, abbreviated 'Is.'), giving PATOIS.