Going north, some suffer a loss of sun (5)
I believe the answer is:
solar
'sun' is the definition.
(I've seen this before)
'going north some suffer a loss' is the wordplay.
'going north' shows that the letters should be reversed in order.
'some' indicates a hidden word (some of the parts of the word are used).
'ralos' is hidden in the letters of 'suffer a loss'.
'ralos' reversed gives 'SOLAR'.
'of' is the link.
(Other definitions for solar that I've seen before include "Sort of power" , "Relating to our star" , "revolutionary system" , "Of the sun, as ray or panel" , "Relating to the sun" .)