Mum or Dad’s brother, a pawnbroker (5)

I believe the answer is:

uncle

I'm a little stuck... Click here to teach me more about this clue!

'pawnbroker' is the definition.
(old-fashioned term for a pawnbroker)

I don't understand the remainder of the clue.

(Other definitions for uncle that I've seen before include "A parent's brother" , "Male relative - pawnbroker" , "Dad's brother" , "older relative" , ". . . . . Sam, the US government" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app