Being cavalier, remove top when the sun goes down (5)
I believe the answer is:
night
'the sun goes down' is the definition.
I can't tell whether this defines the answer.
'being cavalier remove top' is the wordplay.
'being cavalier' becomes 'knight' (I've seen this before).
'remove top' means to remove the first letter (I've seen 'removes top' mean this).
'knight' with its initial letter removed is 'NIGHT'.
'when' is the link.
Can you help me to learn more?
(Other definitions for night that I've seen before include "See 8" , "death" , "Time without 10" , "'The 2 8 of the dog in the _____'" , "Time for bed" .)