Isn't it? It is (7,8)
I believe the answer is:
leading question
'isn't' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?
'it? it is' is the wordplay.
I cannot quite see how this works, but
'it?' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' 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 leading question that I've seen before include "One may be asked by counsel" , "That which prompts the answer required" , "Shouldn't someone recommended be concert-master" .)