Guess Conservative starts to justify economy's course? True for a change (10)
I believe the answer is:
conjecture
'guess' is the definition.
(I've seen this before)
'conservative starts to justify economy's course? true for a change' is the wordplay.
'conservative' becomes 'con' (I've seen this in other clues**).
'starts to' indicates taking the first letters.
'for a change' indicates an anagram.
The first letters of 'justify economys course' is 'jec'.
'true' is an anagram of 'ture'.
'con'+'jec'+'ture'='CONJECTURE'
(Other definitions for conjecture that I've seen before include "opinion without proof" , "Fancy" , "Something supposed" , "Unproven opinion or conclusion" , "Supposition" .)