Crossword Genius

Chief sea (4)

Ross

I believe the answer is:

main

I believe this clue is a double definition.

'chief' is the first definition.
(I know that chief can be written as main)

'sea' is the second definition.
(synonyms)

(Other definitions for main that I've seen before include "Cardinal" , "Principal sea" , "Chief in importance" , "Principal motivation" , "Dominant" .)

I've seen this clue in The Mirror.
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