Crossword Genius

Supporter of sailing? (4)

Ross

I believe the answer is:

mast

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'supporter' is the first definition.
(thesaurus)

'sailing?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for mast that I've seen before include "Nautical pole" , "Long vertical pole" , "Pole on ship" , "Pole aboard; fruit for pigs" , "Spar to support a sail" .)

I've seen this clue in The Mirror.
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