Parboil for cooking in two ways (7)
I believe the answer is:
bipolar
'parboil for cooking in two ways' is the definition.
I can't judge whether this definition defines the answer.
'parboil for cooking' is the wordplay.
'for cooking' indicates anagramming the letters.
'parboil' is an anagram of 'BIPOLAR'.
(Other definitions for bipolar that I've seen before include "going to extremes" , "Manic depressive" , "Involving manic episodes" .)