Crossword Genius

Summer in France, sun hidden, snarl up lasting forever (7)

Ross

I believe the answer is:

eternal

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

'lasting forever' is the definition.
(I've seen this before)

'summer in france sun hidden snarl up' is the wordplay.
I cannot quite understand how this works, but
'in france' could be 'et' (I've seen this in other clues) and 'et' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for eternal that I've seen before include "abiding" , "Not stopping" , "Lasting forever, tediously persistent" , "Imperishable" , "always to be remembered" .)

I've seen this clue in The Everyman puzzle in The Observer.
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