Cryptic crossword clue
Person grilling odd sandwiches is not out to lunch 10

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

I've seen this crossword clue in The Guardian
Q
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Buddy explains!

The straight part
We know that "Person grilling" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case person grilling = questioner.
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 QUESTIONER mean?

QUESTIONER noun
  1. A person who asks questions, or who conducts an official enquiry.

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