Cryptic crossword clue
Half-hearted policeman, copper in the wrong, upset old scientist 10

The most common and most likely answer to this crossword clue is the 10 letter word COPERNICUS

C
O
P
E
R
N
I
C
U
S

Buddy explains!

The straight part
We know that "old scientist" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old scientist = copernicus.
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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