My home has identity taken over by mere relation (14)
I believe the answer is:
correspondence
'relation' is the definition.
(correspondence is a kind of relation)
'my home has identity taken over by mere' is the wordplay.
I cannot really see how this works, but
'my' could be 'cor' (both are expressions of surprise) and 'cor' is located in the answer.
'home' could be 'den' (an animal's home) and 'den' is located in the answer.
'over' could be 'on' (physically on top of) and 'on' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for correspondence that I've seen before include "agreement" , "close similarity" , "Close equivalence" , "Letters, etc" , "post" .)