It’s located through the rear right exits from flat (8)
I believe the answer is:
prostate
'right exits from flat' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'it's located through the rear' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'it' could be 'sa' (old-fashioned abbreviation for sex appeal) and 'sa' is found within the leftover letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for prostate that I've seen is " A protest about a troublesome male gland".)