Freezes and it remains fresh to this day (5,5)

I believe the answer is:

keeps still

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'freezes and it' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'remains fresh to this day' is the wordplay.
'remains fresh' becomes 'keeps' (keeping is a kind of remaining. I am not sure about the 'fresh' bit.).
'to this day' becomes 'still' (I've seen this in another clue).
'keeps'+'still'='KEEPS STILL'

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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