Ultimately hesitate and defer such misguided gloating (13)
I believe the answer is:
schadenfreude
'gloating' is the definition.
(taking pleasure in someone else's suffering)
'ultimately hesitate and defer such misguided' is the wordplay.
'ultimately' indicates one should take the final letters.
'misguided' indicates anagramming the letters (letters guided into the wrong places).
The final letter of 'hesitate' is 'e'.
'e'+'and'+'defer'+'such'='eanddefersuch'
'eanddefersuch' is an anagram of 'SCHADENFREUDE'.
(Other definitions for schadenfreude that I've seen before include "Malicious pleasure in the misfortunes of others" , "Pleasure gained from another's misfortune" , "Delight in the troubles of others" , "Pleasure arising from another's misfortune" , "no sympathy here" .)