Questions idiot about king (4)
I believe the answer is:
asks
'questions' is the definition.
(as in asking a question)
'idiot about king' is the wordplay.
'idiot' becomes 'ass' (I've seen this in other clues).
'about' indicates putting letters inside.
'king' becomes 'K' (abbreviation for king in chess).
'ass' going around 'k' is 'ASKS'.
(Other definitions for asks that I've seen before include "Inquires (4)" , "Invites; enquires" , "Begs" , "Requests information about" , "Demands (something of someone)" .)