Crossword Genius

Defeat decisively, right away (4)

Ross

I believe the answer is:

rout

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'defeat' is the definition.
(rout is a kind of defeat)

'decisively right away' is the wordplay.
'decisively right' becomes 'r' (common abbreviation. I am not sure about the 'decisively' bit.**).
'away' becomes 'out' ('out' can be a synonym of 'away').
'r'+'out'='ROUT'

Can you help me to learn more?

(Other definitions for rout that I've seen before include "Vanquish; thrash" , "Easy victory (or defeat)" , "Total(ly) defeat" , "Defeat comprehensively" , "Overwhelming victory" .)

I've seen this clue in The Telegraph.
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