The most common and most likely answer to this crossword clue is the 8 letter word AMPERAGE
I've seen this crossword clue in The Guardian
A
M
P
E
R
A
G
E
More clues leading to the result AMPERAGE
- Queen in angry display heading off current measure
- Current measure, degree up with furious exercising?
- Current strength for each time period, starting with a month
- A wizard takes company over current strength
- Queen in frenzy having lost lead — charge!
- Current strength of politician beginning to erupt in a temper
- Current English anger initiated by a politician
Buddy explains!

The straight part
We know that "Current strength" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case current strength = amperage.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 AMPERAGE mean?
AMPERAGE noun- The electric current; charge transmitted per unit time, measured in amperes.