Fools ecstatic tackling start of major tax process (10)
I believe the answer is:
assessment
'tax process' is the definition.
'assessment' can be an answer for 'process' (assessment is a kind of process). I am not sure about the 'tax' bit.
'fools ecstatic tackling start of major' is the wordplay.
'fools' becomes 'asses' (ass can mean a foolish person).
'ecstatic' becomes 'sent' (send can mean to stimulate or excite).
'tackling' indicates putting letters inside (to tackle is to take possession of).
'start of' suggests taking the first letters.
The first letter of 'major' is 'm'.
'sent' placed around 'm' is 'sment'.
'asses'+'sment'='ASSESSMENT'
Can you help me to learn more?
(Other definitions for assessment that I've seen before include "Appraisal" , "amount to be paid" , "Process of valuation" , "test" , "Survey" .)