Saving claim one prepared about small company (10)
I believe the answer is:
economical
'saving' is the definition.
(I've seen this before)
'claim one prepared about small company' is the wordplay.
'prepared' indicates anagramming the letters.
'about' is an insertion indicator.
'small company' becomes 'co'.
'claim'+'one'='claimone'
'claimone' is an anagram of 'enomical'.
'enomical' enclosing 'co' is 'ECONOMICAL'.
(Other definitions for economical that I've seen before include "Thrifty" , "Using little" , "Frugal" , "Providing good value" , "Cheap" .)