To the instrument, sing shrilly and dance (8)
I believe the answer is:
hornpipe
'dance' is the definition.
(I know that hornpipe is a type of folk dance)
'to the instrument sing shrilly' is the wordplay.
'to the instrument' becomes 'horn' (horn is a kind of instrument).
'sing shrilly' becomes 'pipe' (I am not sure about the 'shrilly' bit.).
'horn'+'pipe'='HORNPIPE'
'and' is the link.
Can you help me to learn more?
(Other definitions for hornpipe that I've seen before include "Lively jig" , "Lively solo dance associated with sailors" , "Obsolete instrument: naval dance" , "Lively old sailors' dance" , "piece of music for an > old dance" .)