Freely available for panto production (2,3)
I believe the answer is:
on tap
'freely available' is the definition.
(I've seen this before)
'panto production' is the wordplay.
'production' indicates an anagram.
'panto' with letters rearranged gives 'ON TAP'.
'for' acts as a link.
(Other definitions for on tap that I've seen before include "Of liquid gas, ready to be drawn off" , "Ready to be drawn off, like beer" , "Freely available" , "Available (for drinking?)" , "Immediately available like beer in pub" .)