Cryptic crossword clue
Drained, sore internally having fought 7

The most common and most likely answer to this crossword clue is the 7 letter word BRAWLED

I've seen this crossword clue in Independent
B
R
A
W
L
E
D

Buddy explains!

The straight part
We know that "fought" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fought = brawled.
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 BRAWLED mean?

BRAWLED verb
  1. To engage in a brawl; to fight or quarrel.
  2. To create a disturbance; to complain loudly.
  3. Especially of a rapid stream running over stones: to make a loud, confused noise.
  4. To pour abuse on; to scold.
BRAWLED verb
  1. To move to and fro, to quiver, to shake.

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