Slice passed round if a terribly cold dessert (7)
I believe the answer is:
parfait
'cold dessert' is the definition.
'parfait' can be an answer for 'dessert' (parfait is a kind of dessert). I am not certain of the 'cold' bit.
'slice passed round if a terribly' is the wordplay.
'slice' becomes 'part' (I've seen this in another clue).
'passed round' indicates putting letters inside.
'terribly' indicates anagramming the letters.
'if'+'a'='ifa'
'ifa' is an anagram of 'fai'.
'part' enclosing 'fai' is 'PARFAIT'.
Can you help me to learn more?
(Other definitions for parfait that I've seen before include "Rich dessert" , "Escoffier's faultless" , "Rich iced pudding of eggs and cream." , "sweet" , "Fruit and cream dessert" .)