Excise of French allowed by English (6)
I believe the answer is:
delete
'excise' is the definition.
(thesaurus)
'of french allowed by english' is the wordplay.
'of french' becomes 'de'.
'allowed' becomes 'let' (I've seen this before).
'by' says to put letters next to each other.
'english' becomes 'e' (abbreviation).
'de'+'let'+'e'='DELETE'
(Other definitions for delete that I've seen before include "Remove or erase (text)" , "Cancel, erase" , "Get rid of" , "Blot out or erase" , "Key" .)