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Convincingly disagree with a redhead on the tube back (5)

Ross

I believe the answer is:

rebut

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'convincingly disagree' is the definition.
I can't tell whether this definition defines the answer.

'redhead on the tube back' is the wordplay.
'redhead' becomes 'r' (head letter of 'red').
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'back' shows that the letters should be reversed in order.
'tube' back-to-front is 'ebut'.
'r'+'ebut'='REBUT'

'with a' is the link.

Can you help me to learn more?

(Other definitions for rebut that I've seen before include "Overthrow by argument or proof" , "Refure or disprove" , "Drive back" , "Quash" , "Claim or prove to be false" .)

I've seen this clue in the Evening Standard.
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