Romeo has order for gown (4)
I believe the answer is:
robe
'gown' is the definition.
(I've seen this before)
'romeo has order' is the wordplay.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'has' says to put letters next to each other.
'order' becomes 'obe' (**).
'r'+'obe'='ROBE'
'for' acts as a link.
(Other definitions for robe that I've seen before include "habit" , "Long loose garment or dressing gown" , "Loose outer garment" , "Loose or formal garment" , "Old cloak for Boer" .)