Snap, riled about part of the year (5)
I believe the answer is:
april
'part of the year' is the definition.
'april' can be an answer for 'part' (I have seen 'Part of spring' mean 'april' so perhaps 'part' could also mean 'april'). I'm not certain of the 'of the year' bit.
'snap riled about' is the wordplay.
'about' indicates the answer is hidden within the clue (the clue goes around or about the answer).
'APRIL' is hidden within 'snap riled'.
Can you help me to learn more?
(Other definitions for april that I've seen before include "Month to be in England (Browning)" , "Woman" , "Month of showers and of the Queen's birthday" , "March is followed by this" , "Thirty days in spring" .)