Favour parking by river, free for a change (6)
I believe the answer is:
prefer
'favour' is the definition.
(synonyms)
'parking by river free for a change' is the wordplay.
'parking' becomes 'p'.
'by' is a charade indicator (letters next to each other).
'river' becomes 'r'.
'for a change' is an anagram indicator.
'free' with letters rearranged gives 'efer'.
'p'+'r'+'efer'='PREFER'
(Other definitions for prefer that I've seen before include "Tend to choose (one thing over another)" , "Like one better than another" , "Favour, like better" , "as one may with charges" , "support" .)