Spoilt buns removed from tout ensemble arrangement for an egg preparation (8)
I believe the answer is:
omelette
'for an egg preparation' is the definition.
'spoilt buns removed from tout ensemble' is the wordplay.
'spoilt' indicates anagramming the letters.
'removed from' is a deletion indicator.
'tout'+'ensemble'='toutensemble'
'toutensemble' with 'buns' removed is 'toteemle'.
'toteemle' is an anagram of 'OMELETTE'.
'arrangement' acts as a link.
This may not be right. It may belong to another bit of the clue.
(Other definitions for omelette that I've seen before include "something tasty" , "Egg-based dish" , "One getting beaten" , "Item of food i" , "Rope used as lasso" .)