To Charlie, a source of guidance in a boat (7)

I believe the answer is:

coracle

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'boat' is the definition.
(I know that coracle is a type of boat)

I cannot understand how the rest of the clue works.

(Other definitions for coracle that I've seen before include "One-man wicker boat" , "Small paddled boat" , "See boat" , "Small round boat of skin over a wicker frame" , "little boat" .)

I've seen this clue in the Evening Standard.

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