Bognor extension? Test records kept here (8)
I believe the answer is:
registry
'records kept here' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'bognor extension? test' is the wordplay.
I cannot really understand how this works, but
'test' could be 'try' (synonyms) and 'try' is found in the answer.
The remaining letters 'regis' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for registry that I've seen before include "Place where written documents or records are kept" , "Place of record" , "Official written record of names, events etc" , "Place to keep records" , "Place where recorded list is kept" .)