Total amounts you claim at the end (3)
I believe the answer is:
sum
'total' is the definition.
(synonyms)
'amounts you claim at the end' is the wordplay.
'at the end' says to take the final letters.
The final letters of 'amounts you claim' are 'SUM'.
(Other definitions for sum that I've seen before include "Add together" , "Amount of money; total" , "Arithmetic calculation" , "Total; problem" , "Whole" .)