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.
'child' becomes 'ch' (abbreviation for child).
'left out' becomes 'id' (I can't explain this - if you can you should believe this answer much more).
'or'+'ch'+'id'='ORCHID'
Can you help me to learn more?
(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" .)