Cryptic crossword clue
Parasite given heroin by old doctor 10

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

I've seen this crossword clue in The Times
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The straight part
We know that "old doctor" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old doctor = horseleech.
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.

Crossword Answer definitions

HORSELEECH noun
  1. A veterinarian for horses.
  2. A type of sucking worm, Haemopis sanguisuga, larger than the common leech.

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