Plot heron in flight - it's all south from here (5,4)
I believe the answer is:
north pole
'all south from here' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.
'plot heron in flight' is the wordplay.
'in flight' indicates anagramming the letters (the letters fly around).
'plot'+'heron'='plotheron'
'plotheron' anagrammed gives 'NORTH POLE'.
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for north pole that I've seen before include "bleak situation" , "Arctic goal" , "base used by 17d 10a {FATHER CHRISTMAS]" , "Hotel porn (anag)" , "as Pooh found?" .)