Cryptic crossword clue
Instruction to postman, faced with tiny letterbox, to try to achieve more than seems possible? 4,3,8

The most common and most likely answer to this crossword clue is the 4 plus 3 plus 8 letter word PUSH THE ENVELOPE

I've seen this crossword clue in The Daily Telegraph
P
U
S
H
T
H
E
E
N
V
E
L
O
P
E

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.

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