Fool wept tears about Romeo (5)
I believe the answer is:
twerp
'fool' is the definition.
(I've seen this before)
'wept tears about romeo' is the wordplay.
'tears' indicates an anagram.
'about' means one lot of letters goes inside another.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'wept' with letters rearranged gives 'twep'.
'twep' enclosing 'r' is 'TWERP'.
(Other definitions for twerp that I've seen before include "Despicable person" , "Twit" , "Silly person" , "ass" , "Fool" .)