Snake in charge of jelly? (5)
I believe the answer is:
aspic
'jelly?' is the definition.
(I know that aspic is a type of gelatin dessert)
'snake in charge' is the wordplay.
'snake' becomes 'asp' (asp is a kind of snake).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'asp'+'ic'='ASPIC'
'of' is the link.
(Other definitions for aspic that I've seen before include "garnish" , "Savoury jelly for coating meat, eggs etc" , "Gelatin product" , "Savoury relish" , "Lavender" .)