Not many can provide a word of opposite meaning (7)
I believe the answer is:
antonym
'a word of opposite meaning' is the definition.
(I've seen this before)
'not many can' is the wordplay.
'can' indicates anagramming the letters (I've seen 'canned' mean this (canned can mean drunk)).
'not'+'many'='notmany'
'notmany' anagrammed gives 'ANTONYM'.
'provide' is the link.
(Other definitions for antonym that I've seen before include "A word's opposite" , "For villain, hero is one" , "A word opposite in meaning to another" , "opposing description" , "as host is for guest, eg" .)