E.g. more time for homework available after turning sixteen (9)
I believe the answer is:
extension
'e g more time for homework' is the definition.
I can't judge whether this definition defines the answer.
'available after turning sixteen' is the wordplay.
'available' becomes 'on' (on can mean activated or available).
'after' says to put letters next to each other.
'turning' is an anagram indicator.
'sixteen' with letters rearranged gives 'extensi'.
'on' after 'extensi' is 'EXTENSION'.
Can you help me to learn more?
(Other definitions for extension that I've seen before include "Office phone, perhaps" , "time added on" , "Added part" , "more rooms in house maybe" , "Additional rooms" .)