Cryptic crossword clue
Cull in the 18th century perhaps a big step forward 4,3,6

The most common and most likely answer to this crossword clue is the 4 plus 3 plus 6 letter word HALF THE BATTLE

I've seen this crossword clue in The Guardian
H
A
L
F
T
H
E
B
A
T
T
L
E

Buddy explains!

The straight part
We know that "a big step forward" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a big step forward = half the battle.
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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