Master this compiler's Queen after solve (8)
I believe the answer is:
domineer
'master' is the definition.
(domineer can mean to master or control)
'this compiler's queen after solve' is the wordplay.
'this compiler's' becomes 'mine' (belonging to the crossword compiler).
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'after' means one lot of letters go next to another.
'solve' becomes 'do' (I've seen this in other clues).
'mine'+'er'='mineer'
'mineer' after 'do' is 'DOMINEER'.
(Other definitions for domineer that I've seen before include "Deem iron to be changed to overbear" , "Browbeat" , "Tyrrannise" , "Boss around" , "Behave imperiously" .)