Crossword Genius

Disprove underground river’s rising (5)

Ross

I believe the answer is:

rebut

'disprove' is the definition.
(rebutting is a kind of disproving)

'underground river's rising' is the wordplay.
'underground' becomes 'tube' ('tube' can be a synonym of 'underground').
'river' becomes 'r'.
'rising' is a reversal indicator (going up in a down clue).
'tube'+'r'='tuber'
'tuber' back-to-front is 'REBUT'.

(Other definitions for rebut that I've seen before include "Give the lie to" , "Brute can refute" , "Scotch" , "Refute - disprove" , "Disprove an accusation" .)

I've seen this clue in The Times.
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