Steady and true in prudent changes (13)
I believe the answer is:
uninterrupted
'steady' is the definition.
(thesaurus)
'true in prudent changes' is the wordplay.
'changes' indicates an anagram.
'true'+'in'+'prudent'='trueinprudent'
'trueinprudent' with letters rearranged gives 'UNINTERRUPTED'.
'and' acts as a link.
(Other definitions for uninterrupted that I've seen before include "Continual" , "Continuous" .)