Back minister supported by Irish (7)
I believe the answer is:
reverse
'back' is the definition.
(I've seen this before)
'minister supported by irish' is the wordplay.
'minister' becomes 'rev' (I've seen this in other clues).
'supported by' says to put letters next to each other (letters go below - in down clue).
'irish' becomes 'erse' (I've seen this in other clues).
'rev'+'erse'='REVERSE'
(Other definitions for reverse that I've seen before include "Severer (anag.)" , "contrary" , "Rescind (decision)" , "Do u-turn to reserve" , "Countermand" .)