Second course could be cool (6)
I believe the answer is:
modish
'be cool' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'second course' is the wordplay.
'second' becomes 'mo' (both are short periods of time).
'course' becomes 'dish' (I've seen this before**).
'mo'+'dish'='MODISH'
'could' is the link.
Can you help me to learn more?
(Other definitions for modish that I've seen before include "In vogue or fashion" , "in the latest fashion?" , "Temporarily fashionable" , "In fashion or style" , "Trendy" .)