Back minister wanting Irish language (7)
I believe the answer is:
reverse
'back' is the definition.
(I've seen this before)
'minister wanting irish language' is the wordplay.
'minister' becomes 'rev' (short for reverend).
'wanting' says to put letters next to each other.
'irish language' becomes 'Erse' (Erse can mean the Irish language).
'rev'+'erse'='REVERSE'
(Other definitions for reverse that I've seen before include "Rescind (decision)" , "Travel backwards" , "Setback; go back" , "Britannia's place" , "A defeat to go backward" .)