Swan song shows taste (8)
I believe the answer is:
penchant
'taste' is the definition.
(I've seen this before)
'swan song' is the wordplay.
'swan' becomes 'pen' (pen is a kind of swan).
'song' becomes 'chant' (I've seen this before).
'pen'+'chant'='PENCHANT'
'shows' acts as a link.
(Other definitions for penchant that I've seen before include "Predilection, preference" , "Fondness (for) - bias (towards)" , "Willingness" , "weakness" , "'Predilection, a strong liking (8)'" .)