Cryptic crossword clue
Copper that’s invested in dodgy pet deals took a risk 10

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

I've seen this crossword clue in The Daily Telegraph
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Buddy explains!

The straight part
We know that "took a risk" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case took a risk = speculated.
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 SPECULATED mean?

SPECULATED verb
  1. To think, meditate or reflect on a subject; to consider, to deliberate or cogitate.
  2. To make an inference based on inconclusive evidence; to surmise or conjecture.
  3. To make a risky trade in the hope of making a profit; to venture or gamble.
  4. To anticipate which branch of code will be chosen and execute it in advance.

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