A pet source of music? (4)
I believe the answer is:
tape
'music?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.
'a pet source of' is the wordplay.
'source of' indicates an anagram.
'a'+'pet'='apet'
'apet' anagrammed gives 'TAPE'.
Can you help me to learn more?
(Other definitions for tape that I've seen before include "Measure" , "Bind" , "Adhesive strip; record" , "This is often stretched across the finishing line of race" , "Recording material" .)