Where one might bid without restraint (2,6)
I believe the answer is:
in spades
I believe this is a double definition.
'where one might bid' is the first definition.
(bridge)
'without restraint' is the second definition.
(I've seen this before)
(Other definitions for in spades that I've seen before include "by the yard" , "Not half!" , "Where a contract may be made" , "Emphatically" , "Extremely" .)