The compiler's second time bringing in Queen -- excessive! (10)
I believe the answer is:
immoderate
'excessive' is the definition.
('immoderate' can be similar in meaning to 'excessive')
'the compiler's second time' is the wordplay.
'the compiler's' becomes 'im' (I've seen this in other clues).
'second time' becomes 'moderate' (I am not sure about this - if you are sure you should believe this answer much more).
'im'+'moderate'='IMMODERATE'
'bringing in queen' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for immoderate that I've seen before include "Extravagant" , "over the top" , "Reckless" , "Excessive" .)