Bad-tempered about four making good (10)
I believe the answer is:
redemptive
'good' is the definition.
(similar in meaning)
'bad-tempered about four' is the wordplay.
'bad' is an anagram indicator.
'about' means one lot of letters goes inside another.
'four' becomes 'iv' (roman numeral).
'tempered' is an anagram of 'redempte'.
'redempte' enclosing 'iv' is 'REDEMPTIVE'.
'making' acts as a link.
(Other definitions for redemptive that I've seen before include "Saving" , "Helping to save" , "Able to deliver" .)