Right to join one perhaps from Rome rejecting a drug (7)
I believe the answer is:
ritalin
'drug' is the definition.
(I've seen this before)
'right to join one perhaps from rome rejecting a' is the wordplay.
I cannot quite see how this works, but
'right' could be 'r' (common abbreviation) and 'r' is present in the answer.
'one' could be 'li' (I've seen this in other clues) and 'li' is found in the answer.
'a' could be 'an' and 'an' is found in the leftover letters.
The remaining letters 'it' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ritalin that I've seen before include "stimulant" , "Drug" .)