Cryptic crossword clue
Doctor felt urge to include E-number in type of diet

The most common and most likely answer to this crossword clue is the 6 plus 4 letter word GLUTEN FREE

I've seen this crossword clue in The Guardian
G
L
U
T
E
N
F
R
E
E

Buddy explains!

The straight part
We know that "type of diet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case type of diet = gluten free.
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 GLUTEN FREE mean?

GLUTEN FREE adjective
  1. (of food) Containing no gluten.
  2. (of a person) not eating gluten

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