Cryptic crossword clue
Time and space traveller brought back non-meat protein 4

The most common and most likely answer to this crossword clue is the 4 letter word TOFU

T
O
F
U


Buddy explains!

The straight part
We know that "non-meat protein" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case non-meat protein = tofu.
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 TOFU mean?

TOFU noun
  1. A protein-rich food made from curdled soy milk.
  2. A box or rectangle, empty or with a question mark or hexadecimal code inside, displayed by some systems in place of a character not supported by available fonts. (such as □ or ժ)

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