Cryptic crossword clue
Writer includes an afterthought on current digestive aid 6

The most common and most likely answer to this crossword clue is the 6 letter word PEPSIN

I've seen this crossword clue in Independent
P
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The straight part
We know that "digestive aid" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case digestive aid = pepsin.
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 PEPSIN mean?

PEPSIN noun
  1. A digestive enzyme that chemically digests, or breaks down, proteins into shorter chains of amino acids.

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