Nothing to follow essentially cold current savoury dish (4)
I believe the answer is:
olio
'savoury dish' is the definition.
(I've seen this before)
'nothing to follow essentially cold current' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'to follow' says to put letters next to each other (some letters go after or follow others).
'essentially' means to look at the middle letters.
'current' becomes 'I' (physics symbol).
The centre of 'cold' is 'ol'.
'ol'+'i'='oli'
'o' after 'oli' is 'OLIO'.
(Other definitions for olio that I've seen before include "Variety" , "Collection of miscellany" , "Mixture" , "Savoury dish of different types of meat and vegetable" .)