Cook tried a long angry speech (6)
I believe the answer is:
tirade
'long angry speech' is the definition.
(I've seen this in another clue)
'cook tried a' is the wordplay.
'cook' is an anagram indicator.
'tried'+'a'='trieda'
'trieda' with letters rearranged gives 'TIRADE'.
(Other definitions for tirade that I've seen before include "Prolonged speech of abuse" , "Loud harangue" , "Furious denunciation" , "String of invective" , "Long speech of angry criticism" .)