Cryptic crossword clue
Cynical, for example, before good breakfast perhaps 4-6,3

The most common and most likely answer to this crossword clue is the 11 plus 3 letter word HARD=BOILED EGG

I've seen this crossword clue in Financial Times
H
A
R
D
=
B
O
I
L
E
D
E
G
G

Buddy explains!

The straight part
We know that "breakfast perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case breakfast perhaps = hard=boiled egg.
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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