Where it's possible to go far, one notes (6)
I believe the answer is:
africa
'where it's possible' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.
'go far one notes' is the wordplay.
'go' is an anagram indicator (I've seen 'went' mean this ('go' can mean move)).
'one' becomes 'i' (roman numeral).
'notes' becomes 'ca' ().
'far'+'i'='fari'
'fari' with letters rearranged gives 'afri'.
'afri'+'ca'='AFRICA'
'to' is the link.
Can you help me to learn more?
(Other definitions for africa that I've seen before include "Burn; fish" , "Location of 14 downb" , "Continent for 21 Down" , "Continent (6)" , "Out of -, novel by Karen Blixen (filmed)" .)