Cryptic crossword clue
Sci-fi fan runs after vacuous Kirk into wood 7

The most common and most likely answer to this crossword clue is the 7 letter word TREKKER

I've seen this crossword clue in The Guardian
T
R
E
K
K
E
R

Buddy explains!

The straight part
We know that "Sci-fi fan" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sci-fi fan = trekker.
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 TREKKER mean?

TREKKER noun
  1. One who treks; thus, a hiker.
  2. (World War II) A person who spent the night in a rural area, rather than his home, during bombing raids.

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