Attentive to the wrong part (4)
I believe the answer is:
rapt
'attentive' is the definition.
(similar in meaning)
'the wrong part' is the wordplay.
'the wrong' indicates anagramming the letters.
'part' is an anagram of 'RAPT'.
'to' is the link.
(Other definitions for rapt that I've seen before include "Enthralled, captivated" , "Absorbed, fascinated" , "Spellbound in part" , "Ecstatic - engrossed" , "Spellbound, enthralled" .)