Seeming sensible to change (10)
I believe the answer is:
ostensible
'seeming' is the definition.
(synonyms)
'sensible to change' is the wordplay.
'change' indicates an anagram.
'sensible'+'to'='sensibleto'
'sensibleto' with letters rearranged gives 'OSTENSIBLE'.
(Other definitions for ostensible that I've seen before include "Apparent" , "Manifest" , "Supposed" , "Apparently true" , "Professed" .)