Recalibrate tax claim in poor end? (10)
I believe the answer is:
anticlimax
'poor end?' is the definition.
'anticlimax' can be an answer for 'end?' (I have seen 'Disappointing end' mean 'anticlimax' so perhaps 'end' could also mean 'anticlimax'). I'm unsure of the 'poor' bit.
'recalibrate tax claim in' is the wordplay.
'recalibrate' is an anagram indicator (I've seen this in other clues).
'tax'+'claim'+'in'='taxclaimin'
'taxclaimin' is an anagram of 'ANTICLIMAX'.
Can you help me to learn more?
(Other definitions for anticlimax that I've seen before include "Disappointing result" , "Let-down after excitement" , "Come-down" , "disappointment" , "Disappointing end" .)