The XI bats with a real delight (10)
I believe the answer is:
exhilarate
'delight' is the definition.
(thesaurus)
'the xi bats with a real' is the wordplay.
'bats with' indicates an anagram (slang for mad).
'the'+'xi'='thexi'
'a'+'real'='areal'
'thexi' with its letters mixed up with 'areal' gives 'EXHILARATE'.
(Other definitions for exhilarate that I've seen before include "Thrill" , "Cheer" , "Enliven" , "Make very happy or very animated" .)