Settle in French café primarily tucking in to cake (8)
I believe the answer is:
ensconce
'settle' is the definition.
(I know that settle can be written as ensconce)
'in french cafe primarily tucking in to cake' is the wordplay.
'in french' becomes 'en' ('in' in French).
'primarily' indicates taking the first letters.
'tucking in to' is an insertion indicator.
'cake' becomes 'scone' (scone is a type of cake).
The first letter of 'cafe' is 'c'.
'c' put inside 'scone' is 'sconce'.
'en'+'sconce'='ENSCONCE'
(Other definitions for ensconce that I've seen before include "Settle comfortably, establish" , "Settle firmly" , "Nestle" , "Firmly establish" , "hide" .)