Attention surrounds setter regularly in certain time of year (6)
I believe the answer is:
easter
'certain time of year' is the definition.
I can't tell whether this definition defines the answer.
'attention surrounds setter regularly' is the wordplay.
'attention' becomes 'ear' (having someone's ear is having their attention).
'surrounds' indicates putting letters inside.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternate letters of 'setter' are 'ste'.
'ear' enclosing 'ste' is 'EASTER'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for easter that I've seen before include "- Day; - bunny" , "Time to celebrate" , "Egg-rolling time" , "Christian festival in Spring" , "A terse sort of Spring festival?" .)