Cryptic crossword clue
Reluctant advance of check for patching in phone modem again 12

The most common and most likely answer to this crossword clue is the 12 letter word REINSTALLING

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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 REINSTALLING mean?

REINSTALLING verb
  1. To install again.

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