What does the cryptic crossword clue "Primate set over south part of church (4)" mean?

The definition part of the clue is "church". The answer is APSE. Explanation: APe [primate] round S [south]

Primate set over south part of church (4)

Guardian Puzzle #26953 25 Down 2016-08-03

Definition

church

Explanation

APe [primate] round S [south]

Source: Fifteensquared

Answer

APSE