Charlie and Romeo's plant (6)
I believe the answer is:
clover
'plant' is the definition.
(clover is a kind of plant)
'charlie and romeo's' is the wordplay.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'and' means one lot of letters go next to another.
'romeo' becomes 'lover' (I've seen this before).
'c'+'lover'='CLOVER'
(Other definitions for clover that I've seen before include "Trifolium" , "Fodder plant, common on lawns" , "Meadow plant" , "Pea family plant with three-lobed leaves" , "in which we can live luxuriously" .)