Indifferent to game in wintry interlude (4,4)
I believe the answer is:
cold snap
'wintry interlude' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'indifferent to game' is the wordplay.
'indifferent to' becomes 'colds' (I can't explain this - if you can you should give a lot more credence to this answer).
'game' becomes 'nap' (I've seen this before).
'colds'+'nap'='COLD SNAP'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for cold snap that I've seen before include "Sudden brief spell of chilly weather" , "Short wintry spell" , "Brief spell of freezing weather" , "Period of chilly weather" , "Sudden chilly period" .)