Joy making Sue paler (8)
I believe the answer is:
pleasure
'joy' is the definition.
(synonyms)
'making sue paler' is the wordplay.
'making' indicates an anagram.
'sue'+'paler'='suepaler'
'suepaler' with letters rearranged gives 'PLEASURE'.
(Other definitions for pleasure that I've seen before include "Delectation, delight" , "amusement" , "'Enjoyment, delight (8)'" , "A very desirable feeling" , "Enjoyment, happiness" .)