Top four for Arsenal, fantastic for periods of time (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
eras
'periods of time' is the definition.
(an era is a period of time)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for eras that I've seen before include "At least two times" , "Epochs" , "Periods, ages" , "typeface" , "Long and distinct periods of history" .)