The most common and most likely answer to this crossword clue is the 10 letter word HALF-BAKED
H
A
L
F
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B
A
K
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D
Buddy explains!
The straight part
We know that "Foolish" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case foolish = half-baked.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 HALF-BAKED mean?
HALF-BAKED adjective- (frequently derisive) incomplete; (of an idea or scheme) not fully planned or carefully considered, ill-conceived, unsound or badly thought-out; (of a person) foolish or having no common sense.