Cryptic crossword clue
Long struggle of batter: day runs were hard 7,5,3

The most common and most likely answer to this crossword clue is the 7 plus 5 plus 3 letter word HUNDRED YEARS WAR

I've seen this crossword clue in Financial Times
H
U
N
D
R
E
D
Y
E
A
R
S
W
A
R

Buddy explains!

The straight part
We know that "Long struggle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case long struggle = hundred years war.
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.

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