Rule out involving Romeo in piece (7)
I believe the answer is:
excerpt
'piece' is the definition.
(I have seen 'Piece of work' mean 'excerpt' so perhaps 'piece' could also mean 'excerpt')
'rule out involving romeo' is the wordplay.
I cannot really see how this works, but
'rule' could be 'r' (legal abbreviation) and 'r' is located in the answer.
The remaining letters 'except' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'in' acts as a link.
Can you help me to learn more?
(Other definitions for excerpt that I've seen before include "Textual passage" , "a little" , "1D [CLIP]" , "bit of work" , "Extracted passage from book" .)