Available (2,3)
'available' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for on tap that I've seen before include "Where you may see H or C" , "Ready for immediate use" , "handy" , "Constantly available like beer from keg" , "Of liquid gas, ready to be drawn off" .)
'available' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for open that I've seen before include "Not closed or secret" , "yawning" , "Liberal" , "Agape" , "Unenclosed" .)
'available' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for free that I've seen before include "Under no obligation" , "unoccupied)" , "On the house" , "Not occupied; release" , "Not restricted or controlled" .)
'available' is the definition.
(eg available for sale)
This is the entire clue.
(Other definitions for on offer that I've seen before include "available for less" , "is made cheaper?" , "At special price" , "For sale at a certain price" , "For sale at specified price" .)