Set that may ring or call in poorly (8)
I believe the answer is:
carillon
'set that may ring' is the definition.
(set of bells)
'or call in poorly' is the wordplay.
'poorly' is an anagram indicator.
'or'+'call'+'in'='orcallin'
'orcallin' with letters rearranged gives 'CARILLON'.
(Other definitions for carillon that I've seen before include "sound of bells" , "Mechanical bell peal" , "Set of bells playing melodies" , "A set of bells sounded mechanically or from keyboard" , "Set of bells or a tune played on them" .)