Journey down is fair with hint of sun breaking in (7)
I believe the answer is:
descent
'journey down' is the definition.
(I've seen this before)
'fair with hint of sun breaking in' is the wordplay.
I cannot quite understand how this works, but
'sun' could be 's' and 's' is found within the answer.
'fair' could be 'decent' and 'decent' is present in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Other definitions for descent that I've seen before include "that concerns genealogist?" , "Downward journey" , "Decline" , "Fall" , "Downward slope" .)