Supplies accommodating a non-expert (9)
I believe the answer is:
layperson
'non-expert' is the definition.
I can't tell whether this defines the answer.
'supplies accommodating a' is the wordplay.
'supplies' becomes 'layson' (I can't explain this - if you can you should believe this answer much more).
'accommodating' indicates putting letters inside.
'a' becomes 'per' (eg 'one a day' means 'one per day').
'layson' placed around 'per' is 'LAYPERSON'.
Can you help me to learn more?
(Other definitions for layperson that I've seen before include "Non-specialist" , "parishioner?" , "one of his flock maybe" , "Not an expert" , "Amateur" .)