Shelled haricot bean disintegrated without oxygen (9)
I believe the answer is:
anaerobic
'without oxygen' is the definition.
'shelled haricot bean disintegrated' is the wordplay.
'shelled' says to take the centre (the outer letters or shell are removed).
'disintegrated' indicates anagramming the letters.
The centre of 'haricot' is 'arico'.
'arico'+'bean'='aricobean'
'aricobean' anagrammed gives 'ANAEROBIC'.
(Other definitions for anaerobic that I've seen before include "functional without O2" , "lacking in inspiration?" .)