Cryptic crossword clue
‘Number unknown’ appears after man enters web address in a hurry 8

The most common and most likely answer to this crossword clue is the 8 letter word URGENTLY

U
R
G
E
N
T
L
Y

Buddy explains!

The straight part
We know that "in a hurry" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in a hurry = urgently.
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 URGENTLY mean?

URGENTLY adverb
  1. With great haste, with a sense of urgency, because it is very important.
  2. Continuously. With insistence.

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