Convinced to change ties if wearing blue (9)
I believe the answer is:
satisfied
'convinced' is the definition.
(I've seen this before)
'change ties if wearing blue' is the wordplay.
'change' indicates an anagram.
'wearing' indicates putting letters inside.
'blue' becomes 'sad' ('sad' can be similar in meaning to 'blue').
'ties'+'if'='tiesif'
'tiesif' is an anagram of 'tisfie'.
'tisfie' put into 'sad' is 'SATISFIED'.
'to' is the link.
(Other definitions for satisfied that I've seen before include "served" , "Well catered for" , "Complied with (a condition)" , "Convinced" , "as one may be with a second helping" .)