Cryptic crossword clue
Veteran is treated, getting intestinal enzyme 9

The most common and most likely answer to this crossword clue is the 9 letter word INVERTASE

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

INVERTASE noun
  1. An enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose (invert sugar), used by bees to produce honey and in the food industry to soften chocolate.

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