One's soubriquet in prison? (8)
I believe the answer is:
nickname
'one's soubriquet' is the definition.
'nickname' can be an answer for 'soubriquet' (I know this). I am unsure of the 'one's' bit.
'prison?' is the wordplay.
I cannot really understand how this works, but
'prison?' could be 'nick' (slang term for prison) and 'nick' is found within the answer.
The remaining letters 'name' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for nickname that I've seen before include "Familiar form of address" , "Pet appellation" , "Familiar term of address" , "Friendly appellation by which person is known" , "A handle" .)