Crossword Genius

French biologist beyond regret when back-tracking (7)

Ross

I believe the answer is:

pasteur

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

'french biologist' is the definition.
'Pasteur' can be an answer for 'biologist' (Pasteur is an example). I am not sure about the 'french' bit.

'beyond regret when back-tracking' is the wordplay.
'beyond' becomes 'past' (to go beyond something is to go past it).
'regret when' becomes 'rue' (to rue something is to regret it. I am not sure about the 'when' bit.).
'back-tracking' shows that the letters should be reversed in order.
'rue' back-to-front is 'eur'.
'past'+'eur'='PASTEUR'

Can you help me to learn more?

(Other definitions for pasteur that I've seen before include "Louis --, French chemist/bacteriologist" , "He invented a method to stop milk causing disease" , "Louis --, French bacteriologist" , "French chemist and biologist (1822-1895)" , "Pioneer immunologist" .)

I've seen this clue in The Times.
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