Made musical sounds (or maybe squealed?) (4)
I believe the answer is:
sang
'squealed?' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for sang that I've seen before include "Spilt the beans" , "Did numbers" , "Took part in a vocal performance" , "Made music with the voice" , "Chorused" .)