Crossword Genius

Chief in importance (4)

Ross

I believe the answer is:

main

'chief in importance' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for main that I've seen before include "Chief; sea; pipe" , "Source of electricity" , "Cardinal" , "Chief - principal electricity cable" , "Ocean or principal pipe" .)

I've seen this clue in The Times.
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