Much time is taken up in obtuse games (4)
I believe the answer is:
ages
'much time' is the definition.
'ages' can be an answer for 'time' (ages can informally mean a long period). I am unsure of the 'much' bit.
'taken up in obtuse games' is the wordplay.
'taken up' shows that the letters should be reversed in order.
'in' says the answer is hidden in the clue.
'sega' is hidden in the letters of 'obtuse games'.
'sega' in reverse letter order is 'AGES'.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for ages that I've seen before include "Aeons" , "Indefinitely long time" , "Historical eras" , "Epochs" , "Awfully long time" .)