Group taking in Romeo for meal (6)
I believe the answer is:
brunch
'for meal' is the definition.
(brunch is a kind of meal)
'group taking in romeo' is the wordplay.
'group' becomes 'bunch'.
'taking' is an insertion indicator.
'in romeo' becomes 'r' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'bunch' placed around 'r' is 'BRUNCH'.
Can you help me to learn more?
(Other definitions for brunch that I've seen before include "Meal taken before noon, perhaps" , "Mid-morning meal" , "11am meal?" , "combined meal" , "Portmanteau meal" .)