Plant or child left out (6)
I believe the answer is:
orchid
'plant' is the definition.
(orchid is a kind of plant)
'or child left out' is the wordplay.
'left' becomes 'l' (common abbreviation).
'out' indicates named letters should be taken away.
'child' with 'l' taken out is 'chid'.
'or'+'chid'='ORCHID'
(Other definitions for orchid that I've seen before include "Unusually shaped, beautifully coloured flower" , "Glamorous tropical flower" , "Highly prized flower" , "Expensive, perfumed flower" , "Wild (or much cultivated) flower" .)