Hints of sun everywhere, day being calm (6)
I believe the answer is:
sedate
'being calm' is the definition.
(I've seen this before)
'hints of sun everywhere day' is the wordplay.
'hints of' suggests taking the first letters.
'day' becomes 'date' (date is a kind of day).
The first letters of 'sun everywhere' is 'se'.
'se'+'date'='SEDATE'
(Other definitions for sedate that I've seen before include "Dignified and subdued" , "Calm; put to sleep" , "boring" , "Staid and sober" , "Slow" .)