Model man perhaps about to leave non-professional type (9)
I believe the answer is:
layperson
'model man perhaps about to' is the definition.
I can't judge whether this defines the answer.
'non-professional type' is the wordplay.
'non-professional' becomes 'lay' (I've seen this before).
'type' becomes 'person' (I've seen this before).
'lay'+'person'='LAYPERSON'
'leave' acts as a link.
Can you help me to learn more?
(Other definitions for layperson that I've seen before include "Non-specialist" , "parishioner?" , "Amateur" , "one of his flock maybe" , "Not an expert" .)