Opposite of a day trip? (9)
I believe the answer is:
nightfall
'opposite of a day trip?' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'opposite of a day trip?' is the wordplay.
'opposite of a day' becomes 'night' ('night' is the opposite to 'day').
'trip?' becomes 'fall' (trip can mean to fall over).
'night'+'fall'='NIGHTFALL'
Can you help me to learn more?
(Other definitions for nightfall that I've seen before include "when visibility reduces" , "start of the dark time" , "End of day" , "Evening" , "when evenings draw in" .)