Buzz off, as may granny? (3,7)
I believe the answer is:
get knotted
'buzz off' is the definition.
(both are ways of dismissing someone)
'may granny?' is the wordplay.
I cannot quite see how this works, but
'granny?' could be 'knot' (granny is a kind of knot) and 'knot' is found in the answer.
This explanation may well be incorrect...
'as' is the link.
Can you help me to learn more?
(Other definitions for get knotted that I've seen before include "express disapproval thus" , "What your muscles may do" , "Become entangled" , "on your bike" .)