Cross ... Knut scores! (5)

I believe the answer is:

irate

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'cross' is the definition.
(both can mean angry)

'knut scores' is the wordplay.
'knut' becomes 'I' (where the crossword setter is 'Knut').
'scores' becomes 'rate' (I can't justify this - if you can you should give a lot more credence to this answer).
'i'+'rate'='IRATE'

Can you help me to learn more?

(Other definitions for irate that I've seen before include "A tier (anag)" , "Indignant, angry" , "Spitting feathers" , "Angry and incensed" , "Hacked off" .)

I've seen this clue in The Independent.

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