Cleric forces open front of tunic (6)
I believe the answer is:
priest
'cleric' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for priest that I've seen before include "person of religion" , "Art snooper" , "Art looking into" , "Religious teacher" , "with orders" .)