Sighs about the Frecnch winter transport (7)

I believe the answer is:

sleighs

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'sighs about the frecnch winter transport' is the definition.
I can't tell whether this defines the answer.

'sighs about the frecnch' is the wordplay.
'about' is an insertion indicator.
'the frecnch' becomes 'le' (I can't explain this - if you can you should believe this answer much more).
'sighs' placed around 'le' is 'SLEIGHS'.

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(Other definitions for sleighs that I've seen before include "vehicles that skid" , "More than one sledge" , "smooth-running vehicles" .)

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

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