Moron compiler and princess get overtime (5)
I believe the answer is:
idiot
'moron' is the definition.
(I know that moron can be written as idiot)
'compiler and princess get overtime' is the wordplay.
'compiler' becomes 'I' (the person who is writing these clues).
'and' says to put letters next to each other.
'princess' becomes 'di' (Princess Diana).
'get' means one lot of letters go next to another.
'overtime' becomes 'OT' (O and T are abbreviations for over and time).
'i'+'di'+'ot'='IDIOT'
(Other definitions for idiot that I've seen before include "Charlie" , "Foolish character" , "one needing head examined?" , "Dunce" , "Blockhead" .)