Cryptic crossword clue
Fighting resistance where RAF can't, sadly 6,7

The most common and most likely answer to this crossword clue is the 6 plus 7 letter word TRENCH WARFARE

I've seen this crossword clue in The Times
T
R
E
N
C
H
W
A
R
F
A
R
E

Buddy explains!

The straight part
We know that "Fighting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fighting = trench warfare.
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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