Crossword Genius

Our acorns cooked up bitter (9)

Ross

I believe the answer is:

rancorous

'bitter' is the definition.
(synonyms)

'our acorns cooked up' is the wordplay.
'cooked up' is an anagram indicator.
'our'+'acorns'='ouracorns'
'ouracorns' is an anagram of 'RANCOROUS'.

(Other definitions for rancorous that I've seen before include "spiteful?" , "Resentful, bitter" , "Showing bitter resentment" , "Acrimonious" .)

I've seen this clue in the Sydney Morning Herald.
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