Well-known panto in production round Fringe (2,3,3)
I believe the answer is:
on the map
'well-known' is the definition.
(I've seen this in another clue)
'panto in production round fringe' is the wordplay.
'in production' indicates an anagram (I've seen this in other clues).
'round' is an insertion indicator.
'fringe' becomes 'hem' (I've seen this in another clue).
'panto' with letters rearranged gives 'ontap'.
'ontap' enclosing 'hem' is 'ON THE MAP'.
(Other definitions for on the map that I've seen before include "Famous or important - consult atlas?" , "To be taken into account; charted" , "Informally famous - see atlas" .)