Crossword Genius

Festival month sees indefinite number succumbing to ill temper (7)

Ross

I believe the answer is:

jubilee

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'festival' is the definition.
The answer and definition can be both related to time as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for jubilee that I've seen before include "that could be silver or gold?" , "Clip, say" , "SECOND PART OF 15" , "Sort of clip" , "period of rejoicing" .)

I've seen this clue in The Telegraph.
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