Cryptic crossword clue
Mostly note how he cheated: left to break up 2,3,5

The most common and most likely answer to this crossword clue is the 2 plus 3 plus 5 letter word ON THE WHOLE

I've seen this crossword clue in The Guardian
O
N
T
H
E
W
H
O
L
E

Buddy explains!

The straight part
We know that "Mostly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mostly = on the whole.
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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