Disregard holiday (8)
I believe the answer is:
passover
'disregard holiday' is the definition.
The definition and answer can be both related to time as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'disregard holiday' is the wordplay.
'disregard' becomes 'pass' (I've seen this in another clue).
'holiday' becomes 'over' (I can't justify this - if you can you should believe this answer much more).
'pass'+'over'='PASSOVER'
Can you help me to learn more?
(Other definitions for passover that I've seen before include "Disregard - Jewish festival" , "spring festival" , "feast - with 25a" , "religious festival" .)