Fuss following return of cold eggs and fruit (7)
I believe the answer is:
avocado
'fruit' is the definition.
(I know that avocado is a type of fruit)
'fuss following return of cold eggs' is the wordplay.
'fuss' becomes 'ado' (synonyms).
'following' is a charade indicator (letters next to each other).
'return of' is a reversal indicator.
'cold' becomes 'c' (eg on taps).
'eggs' becomes 'ova' (term for egg cells).
'c'+'ova'='cova'
'cova' in reverse letter order is 'avoc'.
'ado' put after 'avoc' is 'AVOCADO'.
'and' acts as a link.
(Other definitions for avocado that I've seen before include "Tropical salad ingredient" , "A dark green pear with cramy flesh" , "Dull greenish colour" , "Fruit with large stone" , "Fruity type" .)