Crossword Genius

Chief means of support (4)

Ross

I believe the answer is:

arch

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This might be a double definition.

'chief' is the first definition.
(synonyms)

'of support' is the second definition.
'arch' can be an answer for 'support'. I'm unsure of the 'of' bit.

'means' acts as a link.

Can you help me to learn more?

(Other definitions for arch that I've seen before include "Prefix meaning cheif, perhaps enemy" , "Curve of a bridge" , "Chief: crafty" , "Bend into upward curve" , "Devilish" .)

I've seen this clue in The Guardian and The Globe and Mail.
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