Crossword Genius

Science that sounds like an improvement on the old, murky sort? (7,7)

Ross

I believe the answer is:

nuclear physics

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

'science' is the definition.
(nuclear physics is a kind of science)

'sounds like an improvement on the old murky sort?' is the wordplay.
I cannot quite see how this works, but
'like' could be 'sic' (I've seen this before) and 'sic' is located in the answer.
'an' could be 'a' and 'a' is located in the answer.
This explanation may well be incorrect...

'that' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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