Privy to put hole in pub (2,2)
I believe the answer is:
in on
'privy to' is the definition.
(I've seen this in another clue)
'hole in pub' is the wordplay.
'hole' becomes 'O' (O looks like a hole).
'in' is an insertion indicator.
'pub' becomes 'inn' (an inn is a type of pub).
'o' inserted within 'inn' is 'IN ON'.
'put' is the link.
(Other definitions for in on that I've seen before include "Privy to" , "Aware of secret" , "Wise to" , "Participating in - knowing about" , "Sharing with" .)