Crossword Genius

Chap has one chief (4)

Ross

I believe the answer is:

main

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

'chap has one' is the wordplay.
'chap' becomes 'man' (chap can mean a man).
'has' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'man' enclosing 'i' is 'MAIN'.

(Other definitions for main that I've seen before include "Most important element" , "Foremost" , "Principal or high seas" , "Most important - high seas?" , "source of gas" .)

I've seen this clue in The Mirror.
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