Sing in ye old style (5)
I believe the answer is:
yodel
'sing' is the definition.
(yodeling is a kind of singing)
'ye old style?' is the wordplay.
'style?' indicates anagramming the letters (I've seen 'styled' mean this).
'ye'+'old'='yeold'
'yeold' with letters rearranged gives 'YODEL'.
'in' acts as a link.
(Other definitions for yodel that I've seen before include "Sing using falsetto" , "Sing in Tyrolean fashion" , "Sing (in the Alps)" , "Alpine song or call" , "Sing in high trilling tone like Swiss mountaineer" .)