Lecturer accepting one is better prepared (7)
I believe the answer is:
readier
'better prepared' is the definition.
(I've seen this in another clue)
'lecturer accepting one' is the wordplay.
'lecturer' becomes 'reader' (synonyms).
'accepting' is an insertion indicator (inserted letters are accepted).
'one' becomes 'i' (Roman numeral).
'reader' going around 'i' is 'READIER'.
'is' is the link.
(Other definitions for readier that I've seen before include "more immediately available" , "More prepared" , "More willing" .)