Good card follows the sun for comfort (6)
I believe the answer is:
solace
'for comfort' is the definition.
(synonyms)
'good card follows the sun' is the wordplay.
'good card' becomes 'ace' (ace is a type of playing card. I am not sure about the 'good' bit.).
'follows' is a charade indicator (letters next to each other).
'the sun' becomes 'sol' (Latin for 'sun').
'ace' after 'sol' is 'SOLACE'.
Can you help me to learn more?
(Other definitions for solace that I've seen before include "Comfort at a time of sadness" , "amusement" , "Comfort in time of distress" , "Comport" , "Comfort and reassurance" .)