Ordinary woman left behind (6)
I believe the answer is:
normal
'ordinary' is the definition.
(I've seen this in another clue)
'woman left behind' is the wordplay.
'woman' becomes 'norma' ().
'left' becomes 'l' (common abbreviation).
'behind' means one lot of letters go next to another.
'norma'+'l'='NORMAL'
(Other definitions for normal that I've seen before include "Customary" , "Usual; at right angles" , "Average or ordinary" , "Standard, typical" , "Usual, typical, expected" .)