An idiot right now (4)
I believe the answer is:
asap
'right now' is the definition.
(I've seen this in another clue)
'an idiot' is the wordplay.
'an' becomes 'a'.
'idiot' becomes 'sap' (sap can mean a foolish or gullible person).
'a'+'sap'='ASAP'
(Other definitions for asap that I've seen before include "Notation-acronym meaning without delay" , "Notation or acronym meaning without avoidable delay" , "At the earliest opportunity (abbrev.)" , "'At the earliest moment, initially (4)'" , "Notation meaning without delay, fast as you can" .)