Cryptic crossword clue
One helping to get rid of a lot, CEO seen as a shark 10

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

I've seen this crossword clue in The Daily Telegraph
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The straight part
We know that "shark" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shark = hammerhead.
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 HAMMERHEAD mean?

HAMMERHEAD noun
  1. The portion of a hammer containing the metal striking face (also including the claw or peen if so equipped).
  2. Any of various sharks of the genus Sphyrna or Zygaena having the eyes set on projections from the sides of the head, which gives it a hammer shape.
  3. A fresh-water fish; the stone-roller, in the minnow family Cyprinidae.
  4. An African fruit bat, the hammer-headed fruit bat, Hypsignathus monstrosus, so called from its large blunt nozzle.
  5. A stupid person, a dunce.
  6. A turn-around; a parking area constructed in a subdivision for initial access and construction.
  7. A kind of ribozyme; hammerhead ribozyme.

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