Absurd sketch Rembrandt at the start disowned (4)
I believe the answer is:
daft
'absurd' is the definition.
(thesaurus)
'sketch rembrandt at the start disowned' is the wordplay.
'sketch rembrandt' becomes 'aft' (I am not sure about this - if you are sure you should believe this answer much more).
'at' means one lot of letters go next to another (I've seen this in other clues).
'the start' says to take the initial letters.
The initial letter of 'disowned' is 'd'.
'aft' put after 'd' is 'DAFT'.
Can you help me to learn more?
(Other definitions for daft that I've seen before include "Bats!" , "Idiotic" , "Half-witted" , "Barmy, crackers" , "'---- as a brush': dotty" .)