Exaggerated this compiler's style and class (10)
I believe the answer is:
immoderate
'exaggerated' is the definition.
(similar in meaning)
'compiler's style and class' is the wordplay.
'compiler's' becomes 'im' (I've seen this in other clues).
'style' becomes 'mode' (synonyms).
'and' means one lot of letters go next to another.
'class' becomes 'rate' (class can mean to rank or rate).
'im'+'mode'+'rate'='IMMODERATE'
'this' acts as a link.
(Other definitions for immoderate that I've seen before include "Reckless" , "Extravagant" , "Excessive" , "over the top" .)