Hold up in tax claim is a let-down! (10)
I believe the answer is:
anticlimax
'a let-down' is the definition.
(I've seen this before)
'hold up in tax claim' is the wordplay.
'in tax claim' anagrams to 'ANTICLIMAX'.
But, I am unsure how the anagram is indicated.
'is' is the link.
Can you help me to learn more?
(Other definitions for anticlimax that I've seen before include "Let-down after excitement" , "Disappointing ending" , "Disappointing result" , "disappointing outcome" , "Disappointing end" .)