Shut up in a nice way, initially (5)

I believe the answer is:

swalk

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'shut up' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'in a nice way initially' is the wordplay.
'in' indicates putting letters inside.
'a nice' becomes 'salk' (I am not sure about this - if you are sure you should believe this answer much more).
'initially' suggests taking the first letters.
The first letter of 'way' is 'w'.
'salk' going around 'w' is 'SWALK'.

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