How the interrogator got inside? (6,9)
I believe the answer is:
'inside?' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's an association between them I don't understand?
'how the interrogator got' is the wordplay.
I cannot really understand how this works, but
'got' could be 'gained' (gaining is a kind of getting) and 'gained' is found within the answer.
The remaining letters 'admission' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?