6 down
Boat
to
have
sufficient
power
to
go
round
a
river
(9)
Boat to have sufficient power to go round a river (9)
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The definition is at the beginning of the clue.
How the clue works
Boat is the definition. "To have sufficient power" gives CAN, which is split open to wrap around A (the article "a") plus TAMAR (the river running through Devon and Cornwall), giving C-A-TAMAR-AN.