The most common and most likely answer to this crossword clue is the 9 letter word REMEASURE
R
E
M
E
A
S
U
R
E
More clues leading to the result REMEASURE
Buddy explains!
The straight part
We know that "gauge again" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gauge again = remeasure.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 REMEASURE mean?
REMEASURE verb- To measure again.