Cryptic crossword clue
Animal killer in ridiculous energy-wasting operations 3-6

The most common and most likely answer to this crossword clue is the 10 letter word RAT-POISON

I've seen this crossword clue in The Times
R
A
T
-
P
O
I
S
O
N

Buddy explains!

The straight part
We know that "Animal killer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case animal killer = rat-poison.
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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