Icer Sal used especially for cakes (7)
I believe the answer is:
eclairs
'for cakes' is the definition.
(eclair is a type of cake)
'icer sal used especially' is the wordplay.
'used especially' indicates an anagram.
'icer'+'sal'='icersal'
'icersal' is an anagram of 'ECLAIRS'.
(Other definitions for eclairs that I've seen before include "Elongated cream puffs" , "Oblong pastries" , "in which la creme may be found?" , "sticky fingers" , "Cream cakes" .)