Rate adjusted to include ten more (5)
I believe the answer is:
extra
'more' is the definition.
(thesaurus)
'rate adjusted to include ten' is the wordplay.
'adjusted' is an anagram indicator.
'to include' is an insertion indicator.
'ten' becomes 'x' (roman numeral).
'rate' with letters rearranged gives 'etra'.
'etra' going around 'x' is 'EXTRA'.
(Other definitions for extra that I've seen before include "Bolt-on" , "More than usual" , "An increased amount" , "Additional expense" , "Additional - bye" .)