Start to eat fish in my official residence (7)
I believe the answer is:
embassy
'official residence' is the definition.
'embassy' can be an answer for 'residence' (I have seen 'Diplomatic residence ' mean 'embassy' so perhaps 'residence' could also mean 'embassy'). I am unsure of the 'official' bit.
'start to eat fish in my' is the wordplay.
'start to' suggests taking the first letters.
'fish' becomes 'bass' (bass is a kind of fish).
'in' is an insertion indicator.
The initial letter of 'eat' is 'e'.
'bass' put into 'my' is 'mbassy'.
'e'+'mbassy'='EMBASSY'
Can you help me to learn more?
(Other definitions for embassy that I've seen before include "Residence of foreign diplomatic representative" , "Foreign Office" , "senior diplomat's residence ..." , "Where an ambassador lives or works" , "Ambassador's office" .)