Model turning up bags has meal order (8)
I believe the answer is:
tidiness
'meal order' is the definition.
'tidiness' can be an answer for 'order' (tidiness is a kind of order). I am unsure of the 'meal' bit.
'model turning up bags has' is the wordplay.
'model' becomes 'sit' (e.g. for a painting).
'turning up' shows that the letters should be reversed in order.
'bags' means one lot of letters goes inside another (bag can mean secures or steals).
'has' becomes 'dines' (I've seen this before).
'sit' written backwards gives 'tis'.
'tis' going around 'dines' is 'TIDINESS'.
Can you help me to learn more?
(Other definitions for tidiness that I've seen before include "Insisted on neatness." , "Quality of neatness and orderliness" , "sense of order" , "good order" , "Orderly quality" .)