It's quiet in typical museum (4)
I believe the answer is:
calm
'it's quiet' is the definition.
('calm' can be similar in meaning to 'quiet')
'in typical museum' is the wordplay.
'in' indicates the answer is hidden within the clue.
'CALM' is hidden in the letters of 'typical museum'.
(Other definitions for calm that I've seen before include "Peaceful and unexcited" , "Halcyon" , "Tranquil, undisturbed" , "'After a storm comes a ....'" , "Cool and collected" .)