Choose some of the lectures (5)
I believe the answer is:
elect
'choose' is the definition.
(I know that elect is a more specific form of choose)
'some of the lectures' is the wordplay.
'some of' says the answer is hidden in the clue.
'ELECT' can be found hidden inside 'the lectures'.
(Other definitions for elect that I've seen before include "Select; chosen" , "special people" , "Return" , "Put into power through the ballot box" , "Preferred" .)