Crossword Genius

Nevertheless, it can be quiet at night (5)

Ross

I believe the answer is:

still

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

'nevertheless' is the definition.
(I know that nevertheless can be written as still)

'it can be quiet at night' is the wordplay.
I cannot quite understand how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is present in the answer.
The remaining letters 'sill' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for still that I've seen before include "gentle" , "Static photograph" , "Yet - hushed" , "Source of alcohol" , "Even now; not moving" .)

I've seen this clue in the Evening Standard.
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