Attractive Romeo ditched as small-minded (5)
I believe the answer is:
petty
'small-minded' is the definition.
('petty' can be a synonym of 'small-minded')
'attractive romeo ditched' is the wordplay.
'attractive' becomes 'pretty' (I've seen this before).
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'ditched' suggests deleting specific letters.
'pretty' with 'r' taken away is 'PETTY'.
'as' acts as a link.
(Other definitions for petty that I've seen before include "Trivial, contemptible" , "small" , "Marked by narrowness of mind" , "Unimportant" , "Trivial, piffling" .)