Cryptic crossword clue
Playing Romeo etc Peter felt able to deliver lines flawlessly 6-7

The most common and most likely answer to this crossword clue is the 14 letter word LETTER-PERFECT

I've seen this crossword clue in Financial Times
L
E
T
T
E
R
-
P
E
R
F
E
C
T

Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does LETTER-PERFECT mean?

LETTER-PERFECT adjective
  1. Exactly correct, correct in every letter.

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