Readily available — endlessly recorded? (2,3)
I believe the answer is:
on tap
'readily available' is the definition.
(I've seen this in another clue)
'endlessly recorded?' is the wordplay.
'endlessly' means to remove the last letter.
'recorded?' becomes 'ontape' (I've seen this in another clue).
'ontape' with its last letter taken away is 'ON TAP'.
(Other definitions for on tap that I've seen before include "Of liquid gas, ready to be drawn off" , "kept in a cask" , "Ready to be drawn off, like beer" , "Ready to be drawn off, say beer" , "Where to find a washer" .)