Mourn the French soldiers taken at the front (6)

I believe the answer is:

lament

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'mourn' is the definition.
(thesaurus)

'the french soldiers taken at the front' is the wordplay.
'the french' becomes 'la'.
'soldiers' becomes 'men' (I've seen this before).
'taken' means one lot of letters go next to another.
'at the front' becomes 't' (I can't justify this - if you can you should believe this answer much more).
'la'+'men'+'t'='LAMENT'

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(Other definitions for lament that I've seen before include "Express disappointment" , "Mental (anag)" , "Mourn for; deplore" , "Mourn , bewail the loss of" , "Mourn, express regret" .)

I've seen this clue in The Telegraph.

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