Crossword Genius

US anthem is fermenting feeling of excitement (10)

Ross

I believe the answer is:

enthusiasm

'feeling of excitement' is the definition.
(being excited or enthusiastic about something)

'us anthem is fermenting' is the wordplay.
'fermenting' indicates anagramming the letters.
'us'+'anthem'+'is'='usanthemis'
'usanthemis' with letters rearranged gives 'ENTHUSIASM'.

(Other definitions for enthusiasm that I've seen before include "Avidity" , "Ardour" , "Zeal" , "spirit?" , "Intense and lively interest" .)

I've seen this clue in The Telegraph.
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