Value penning note in French, describing testing translation? (6)

I believe the answer is:

unseen

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'testing translation?' is the definition.
'unseen' can be an answer for 'translation?' (I've seen this before). I'm not certain of the 'testing' bit.

'value penning note in french' is the wordplay.
'value' becomes 'use' (Use is a type of value in economics).
'penning' is an insertion indicator.
'note' becomes 'n' (abbreviation).
'in french' becomes 'en' ('in' in French).
'use' placed around 'n' is 'unse'.
'unse'+'en'='UNSEEN'

'describing' acts as a link.

Can you help me to learn more?

(Other definitions for unseen that I've seen before include "Invisable" , "not spotted" , "Unnoticed" , "Invisible or not observed" , "Hidden from view" .)

I've seen this clue in The Times.

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