Priest in a dream represents faith, renouncing the world, staying away from suspicion or priest in a dream could also represent an Imam, guide, a wise man whose instructions people obey and respect or an example to be followed. Priest in a dream could also represent someone who follows conjecture or someone who does not see his own faults. If a regular person sees himself as a priest, it means rising in fame or benefits for others. And if a layman sees that he is speaking like a soothsayer, a preacher, an astrologer or a fortuneteller or a priest, it means he lies and engages in falsehood. Source: Ibn Sirin
Being a priest in a dream means that the dreamer is extremely heretical:
He will be praised by people but after facing extraordinary hardships, fear, terror and including hard living, as the word for priest in Arabic is raheb, from rahba, meaning “awe and terror.” Source: Ibn Sirin
He is shrewd and deceitful. Source: Ibn Sirin
