Characters in good book mixed items for sale (3,3)
I believe the answer is:
job lot
This clue might be a double definition.
'characters in good book' is the first definition.
'job lot' can be an answer for 'characters' (I have seen 'biblical characters' mean 'job lot' so perhaps 'characters' could also mean 'job lot'). I'm unsure of the 'in good book' bit.
'mixed items for sale' is the second definition.
(multiple items sold together)
(Other definitions for job lot that I've seen before include "Miscellany of sale items" , "discounted items" , "Miscellaneous collection sold as one item" , "Collection of odds and ends for sale" , "Collection under the hammer" .)