Imagine fringes of tunic getting altered - it's inexplicable (9)
I believe the answer is:
enigmatic
'inexplicable' is the definition.
(thesaurus)
'imagine fringes of tunic getting altered' is the wordplay.
'fringes of' suggests removing the centre.
'getting altered' indicates an anagram.
'tunic' with its middle taken out is 'tc'.
'imagine'+'tc'='imaginetc'
'imaginetc' is an anagram of 'ENIGMATIC'.
'it's' is the link.
(Other definitions for enigmatic that I've seen before include "not obvious" , "Obscure, puzzling" , "with mysterious substance" , "with a mystery ingredient" , "Mysterious or puzzling, like Mona Lisa's smile" .)