Convinced cleric currently upset about nothing (3,4)
I believe the answer is:
won over
'convinced' is the definition.
(I've seen this in another clue)
'cleric currently upset about nothing' is the wordplay.
'cleric' becomes 'Rev' (abbreviation for Reverend).
'currently' becomes 'now' (right now).
'upset' shows that the letters should be reversed in order.
'about' means one lot of letters goes inside another.
'nothing' becomes 'O' (looks like zero - 0).
'rev'+'now'='revnow'
'revnow' backwards is 'wonver'.
'wonver' placed around 'o' is 'WON OVER'.
(Another definition for won over that I've seen is " Persuaded someone".)