Folksinger Burl (4)
I believe the answer is:
ives
'folksinger burl' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ives that I've seen before include "St -, Cornish resort" , "US composer, d. 1954 - US folk singer, d. 1995" , "Charles -, American composer (The Unanswered Question)" , "This classical composer" , "Saint of Cornwall or Cambridgeshire" .)