Idiots delighted about marks in test (10)
I believe the answer is:
assessment
'test' is the definition.
(an assessment is a test or examination)
'idiots delighted about marks in' is the wordplay.
'idiots' becomes 'asses' (I've seen this before).
'delighted' becomes 'sent' (I've seen this in another clue).
'about marks' becomes 'm' (former German currency. I am not sure about the 'about' bit.).
'in' is an insertion indicator.
'sent' going 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" , "Opinion" , "Survey" , "Process of valuation" , "Review" .)