Isn't prepared for the round-about ahead (2,5)
I believe the answer is:
in store
'ahead' is the definition.
(I've seen this before)
'isn't prepared for the round' is the wordplay.
'prepared' is an anagram indicator.
'for' means one lot of letters go next to another.
'the round' becomes 'ore' (I can't explain this - if you can you should give a lot more credence to this answer).
'isnt' with letters rearranged gives 'inst'.
'inst'+'ore'='IN-STORE'
'about' acts as a link.
Can you help me to learn more?
(Other definitions for in store that I've seen before include "Awaiting delivery" , "stocked" , "Ready for future use" , "Waiting" , "To come" .)