Old songwriter has butchers dancing (8)
I believe the answer is:
schubert
'old songwriter' is the definition.
The definition suggests a singular noun which matches the answer.
'butchers dancing' is the wordplay.
'dancing' is an anagram indicator.
'butchers' with letters rearranged gives 'SCHUBERT'.
'has' acts as a link.
Can you help me to learn more?
(Other definitions for schubert that I've seen before include "Austrian composer, d. 1828" , "barman" , "Franz --, his Unfinished symphony is famous" , "Franz -, Austrian composer (Trout Quintet, etc)" , "Franz --, Viennese composer" .)