Crossword Genius

Period when one's spirits may be at their lowest? (5,4)

Ross

I believe the answer is:

happy hour

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'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" .)

I've seen this clue in The Independent.
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