Shut up in winter, normally (6)
I believe the answer is:
intern
'shut up' is the definition.
(I've seen this before)
'in winter normally' is the wordplay.
'in' indicates the answer is hidden within the clue.
'INTERN' is hidden within 'winter normally'.
(Other definitions for intern that I've seen before include "Often unpaid trainee" , "Lock up the hospital doctor" , "Shut up" , "Detain in custody" , "(American) hospital doctor" .)