Promiscuous and outspoken cleric, unpredictable customer (5,6)
I believe the answer is:
loose cannon
'unpredictable customer' is the definition.
I know nothing about this answer so I cannot tell whether this works.
'promiscuous and outspoken cleric' is the wordplay.
'promiscuous' becomes 'loose' (loose can mean promiscuous).
'and' says to put letters next to each other.
'outspoken' shows a homophone (sound like) (as the word might be spoken).
'cleric' becomes 'canon' (I've seen this before).
'canon' sounds like 'cannon'.
'loose'+'cannon'='LOOSE CANNON'
Can you help me to learn more?
(Other definitions for loose cannon that I've seen before include "Dangerously unpredictable person" , "liability" , "unpredictable type" , "Unpredictable person liable to cause harm" , "Unpredictable character" .)