Blend egg in cake mixture initially, then beat (8)
I believe the answer is:
compound
'blend' is the definition.
(thesaurus)
'egg in cake mixture initially then beat' is the wordplay.
'egg' becomes 'o' (I've seen this in other clues).
'in' is an insertion indicator.
'initially' indicates taking the first letters.
'then beat' becomes 'pound' ('pound' can be a synonym of 'beat'. I am not sure about the 'then' bit.**).
The first letters of 'cake mixture' is 'cm'.
'o' placed within 'cm' is 'com'.
'com'+'pound'='COMPOUND'
(Other definitions for compound that I've seen before include "Living enclosure; type of interest" , "In this fracture, bone has pierced the skin" , "Exacerbate - enclosure" , "POW camp" , "Chemical substance; enclosed space" .)