Support for stringed instrument or platform for nautical pilot (6)

I believe the answer is:

bridge

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'support' is the definition.
(I know that bridge is a type of support)

I can't explain the rest of the clue.

(Other definitions for bridge that I've seen before include "Structure carrying a road, railway etc." , "Crossing structure" , "Where four hands are needed" , "Something of a nose" , "Spanning structure to allow passage" .)

I've seen this clue in the Sydney Morning Herald.

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