Crossword Genius

How many took the wrong route through the marsh? (8)

Ross

I believe the answer is:

fourteen

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'how many took' is the definition.
I can't judge whether this defines the answer.

'wrong route through the marsh?' is the wordplay.
'wrong' indicates an anagram.
'through' is an insertion indicator (inserted letters go through the word).
'the marsh?' becomes 'fen' ('fen' can be a synonym of 'marsh').
'route' is an anagram of 'ourte'.
'ourte' going inside 'fen' is 'FOURTEEN'.

'the' is the link.

Can you help me to learn more?

(Other definitions for fourteen that I've seen before include "XIV" , "Fen route (anag)" , "Number of lines in a sonnet" , "Pounds in a stone?" .)

I've seen this clue in the Evening Standard.
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