Crossword Genius

Oh no! The brain's crazily, ridiculously complex! (5-8)

Ross

I believe the answer is:

heath robinson

'ridiculously complex' is the definition.
('Heath Robinson' can mean over-complicated)

'oh no the brain's crazily' is the wordplay.
'crazily' indicates an anagram.
'oh'+'no'+'the'+'brains'='ohnothebrains'
'ohnothebrains' with letters rearranged gives 'HEATH-ROBINSON'.

(Other definitions for heath robinson that I've seen before include "over-elaborate in style" , "Absurdly complicated in design (for a machine)" , "Ridiculously complicated in design" , "quirky illustrator" , "Cartoonist noted for fantastic machinery" .)

I've seen this clue in The Telegraph.
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