Uncle perhaps might introduce connection... (5,8)
I believe the answer is:
blood relation
'uncle' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'might introduce connection' is the wordplay.
I cannot quite see how this works, but
'connection' could be 'relation' (I've seen this before) and 'relation' is present in the answer.
The remaining letters 'blood' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'perhaps' acts as a link.
Can you help me to learn more?
(Another definition for blood relation that I've seen is " Relative by birth".)