Cryptic crossword clue
River edge circling round damaged tree – this gauges current 9

The most common and most likely answer to this crossword clue is the 9 letter word RHEOMETER

R
H
E
O
M
E
T
E
R

Buddy explains!

The straight part
We know that "this gauges current" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this gauges current = rheometer.
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 RHEOMETER mean?

RHEOMETER noun
  1. A device used to measure the flow properties of fluids with variable viscosity.
  2. A device used to measure the flow of electric current: an ammeter.
  3. A flowmeter, especially for water or blood.

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