Antic no reformer could comprehend (7)
I believe the answer is:
contain
'comprehend' is the definition.
(thesaurus)
'antic no reformer' is the wordplay.
'antic no' can be anagrammed to 'CONTAIN'.
Though, I am not sure how the anagram is indicated.
'could' acts as a link.
Can you help me to learn more?
(Other definitions for contain that I've seen before include "Carry" , "I cannot (anag) - hold back" , "Accommodate" , "Enclose" , "keep within bounds" .)