Judge sees dope and ecstasy used by two sons (6)
I believe the answer is:
assess
'judge' is the definition.
(to assess is to judge or rate)
'dope and ecstasy used by two sons' is the wordplay.
'dope' becomes 'ass' (both can mean a stupid person).
'and' is a charade indicator (letters next to each other).
'ecstasy' becomes 'E' (informal term for the drug).
'used by' says to put letters next to each other.
'two sons' becomes 'ss' (genealogical abbreviation for son written twice. I am not sure about the 'two' bit.).
'ass'+'e'+'ss'='ASSESS'
'sees' is the link.
Can you help me to learn more?
(Other definitions for assess that I've seen before include "Gauge, evaluate" , "Evaluate (quality)" , "Rate, evaluate" , "Judge the quality of" , "(Of a tax) determine the amount to be paid" .)