The most common and most likely answer to this crossword clue is the 6 letter word ANORAK
I've seen this crossword clue in The Guardian
A
N
O
R
A
K
More clues leading to the result ANORAK
- Woman wearing a kid’s first waterproof jacket
- Obsessive geek is a girl in a thousand
- Jacket, cardigan or a kid’s clothes
- One with obsessive interest in the origin of Arabia translated Koran
- Trainspotter‘s article artist displayed in fair
- Gradual reduction in amount coming from volcano? Extra work towards the end for nerd
- One bloody woman initially kissed trainspotter
- Ex-serviceman or a keen train spotter, maybe
- Article with piece about female trainspotter
- Dull specialist clothing
Buddy explains!

The straight part
We know that "trainspotter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case trainspotter = anorak.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 ANORAK mean?
ANORAK noun- A heavy weatherproof jacket with an attached hood; a parka or windcheater.
- A geek or nerd, possibly originally either a train spotter or a fan of off-shore pirate radio.