Perhaps Vincent de Paul, a priest in Gascony, brought up burps (6)

'burps' is the definition.
(I know this)

'perhaps vincent de paul a priest in gascony brought up' is the wordplay.
'perhaps vincent de paul' becomes 'St' (St Vincent de Paul is an example).
'a priest in gascony' becomes 'cure' ('priest' in French - Gascony is in France).
'brought up' says the letters should be written in reverse (in a down clue, letters go up).
'st'+'cure'='stcure'
'stcure' backwards is 'ERUCTS'.