It's beyond mature for Romeo to remove intro on last letters to sweetheart (8)
I believe the answer is:
overripe
'remove intro on last letters to sweetheart' is the definition.
I can't tell whether this defines the answer.
'it's beyond mature for romeo' is the wordplay.
'it's beyond' becomes 'ove' (I can't justify this - if you can you should give a lot more credence to this answer).
'mature' becomes 'ripe' ('ripe' can be similar in meaning to 'mature').
'for' is a charade indicator (letters next to each other) (I've seen this in other clues).
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'ripe' after 'r' is 'rripe'.
'ove'+'rripe'='OVERRIPE'
'to' is the link.
Can you help me to learn more?
(Other definitions for overripe that I've seen before include "Matured too long , not good to eat" , "(Of fruit) past its best" , "(Of fruit, cheese, etc) past the usual stage for eating" , "More than ready" , "More than mature, fruit say" .)