Unsatisfying resolution where claimant I gathered has got cross (10)
I believe the answer is:
anticlimax
'unsatisfying resolution' is the definition.
(anticlimax matches up with the definition unsatisfying resolution)
'claimant i gathered has got cross' is the wordplay.
'gathered' indicates an anagram (the letters are gathered into a new order).
'has got' means one lot of letters go next to another.
'cross' becomes 'x' (an X is a cross).
'claimant'+'i'='claimanti'
'claimanti' is an anagram of 'anticlima'.
'anticlima'+'x'='ANTICLIMAX'
'where' acts as a link.
(Other definitions for anticlimax that I've seen before include "Let-down after excitement" , "disappointment" , "Disappointing result" , "Disappointing end" , "disappointing outcome" .)