Its first belongs to fools! (5)
I believe the answer is:
april
If this is the answer I cannot explain how the clue works.
Can you help me to learn more?
(Other definitions for april that I've seen before include "Month of showers and of the Queen's birthday" , "Spring month" , "Fourth month" , "TS Eliot's 'cruelest month'" , "March is followed by this" .)