Period when one's spirits may be at their lowest? (5,4)
I believe the answer is:
happy hour
'period' is the definition.
The answer and definition can be both related to time as well as being singular nouns.
Maybe there's an association between them I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for happy hour that I've seen before include "pub's promotion" , "Period of reduced prices in public bar" , "Period of cheap drinks" , "Cheap drinking time" , "beer goes down" .)