Strange, how fat fell when cooked (3-3-4)
I believe the answer is:
off-the-wall
'strange' is the definition.
(I've seen this before)
'how fat fell when cooked' is the wordplay.
'when cooked' is an anagram indicator.
'how'+'fat'+'fell'='howfatfell'
'howfatfell' is an anagram of 'OFF-THE-WALL'.
(Other definitions for off-the-wall that I've seen before include "Original" , "Conspicuously or grossly unconventional" , "like a newly escaped convict?" .)