New student blocking access for training (9,6)
I believe the answer is:
refresher course
'training' is the definition.
(I've seen this before)
'new student blocking access' is the wordplay.
'new student' becomes 'fresher' (I've seen this before).
'blocking' is an insertion indicator (block can mean to plug a gap in something).
'access' becomes 'recourse' (I've seen this before).
'fresher' going within 'recourse' is 'REFRESHER COURSE'.
'for' acts as a link.
(Other definitions for refresher course that I've seen before include "it helps you get up to speed" , "further education?" , "study update" , "sweet group?" , "Training" .)