First Minister tense, doctor admits (8)
I believe the answer is:
sturgeon
'first minister' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'tense doctor admits' is the wordplay.
'tense' becomes 't' (abbreviation used in many dictionaries).
'doctor' becomes 'surgeon' (surgeon is a kind of doctor).
'admits' means one lot of letters goes inside another.
't' placed into 'surgeon' is 'STURGEON'.
Can you help me to learn more?
(Other definitions for sturgeon that I've seen before include "swimmer" , "So urgent to find caviare-bearing fish" , "Egg producer" , "The fish for caviars" , "Fish that yields caviare" .)