Crossword Genius

What means within a crashed train? (5)

Ross

I believe the answer is:

intra

I'm a little stuck... Click here to teach me more about this clue!

'what means within a' is the definition.
I can't judge whether this defines the answer.

'crashed train?' is the wordplay.
'crashed' is an anagram indicator.
'train' anagrammed gives 'INTRA'.

Can you help me to learn more?

(Other definitions for intra that I've seen before include "privately?" , "inside" , "Prefix meaning within" , "Prefix in train" .)

I've seen this clue in the Sydney Morning Herald.
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