Be hesitant following change (6)
I believe the answer is:
falter
'be hesitant' is the definition.
(I've seen this before)
'following change' is the wordplay.
'following' becomes 'f' (used when citing page numbers etc).
'change' becomes 'alter' (synonyms).
'f'+'alter'='FALTER'
(Other definitions for falter that I've seen before include "Hesitate, be uncertain" , "Hesitate, waver" , "Be hesitant" , "Stumble, hesitate" , "flag" .)