Attentive to wrong part (4)
I believe the answer is:
rapt
'attentive' is the definition.
(similar in meaning)
'wrong part' is the wordplay.
'wrong' is an anagram indicator.
'part' is an anagram of 'RAPT'.
'to' is the link.
(Other definitions for rapt that I've seen before include "Enchanted in part" , "Wholly engrossed" , "Spellbound, enthralled" , "Fully absorbed" , "Gripped" .)