Disparage Anglo-Saxon prize when it's announced (7)

I believe the answer is:

asperse

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'disparage anglo-saxon prize' is the definition.
'asperse' can be an answer for 'disparage' (I've seen this before). I'm unsure of the 'anglo-saxon prize' bit.

'when it's announced' is the wordplay.
'when' becomes 'as' (eg 'when I walked' means 'as I walked').
'it's announced' becomes 'perse' (I can't explain this - if you can you should give a lot more credence to this answer).
'as'+'perse'='ASPERSE'

Can you help me to learn more?

(Other definitions for asperse that I've seen before include "Slander like Parsees" , "Disparage" , "Malign" , "Accuse falsely" , "Call names" .)

I've seen this clue in The Independent.

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