This writer's style to consider extravagant? (10)
I believe the answer is:
immoderate
'extravagant?' is the definition.
(thesaurus)
'this writer's style to consider' is the wordplay.
'this writer's' becomes 'im' (the person writing the crossword clues).
'style' becomes 'mode' ('mode' can be a synonym of 'style'**).
'to consider' becomes 'rate' (I've seen this before).
'im'+'mode'+'rate'='IMMODERATE'
(Other definitions for immoderate that I've seen before include "Excessive" , "Reckless" , "over the top" , "Extravagant" .)