Xylophone cousin (5)
I believe the answer is:
vibes
'xylophone cousin' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for vibes that I've seen before include "Jazz percussion instrument - sensations" , "Mental or emotional stimuli" , "Feelings emanating from a person or place" , "Feelings that seem to emanate" , "Mental or emotional sensations" .)