Crossword Genius

Supported by (4)

Ross

I believe the answer is:

upon

'supported by' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for upon that I've seen before include "On tope of" , "voucher, business stopped" , "Onto" , "Straddling" , "Thereafter" .)

I've seen this clue in The Times, The Guardian, the Boston Globe and the L.A. Times Daily.
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