Notice academics make extra charges (3-3)
I believe the answer is:
add-ons
'extra charges' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'notice academics' is the wordplay.
'notice' becomes 'ad'.
'academics' becomes 'dons' (I've seen this before).
'ad'+'dons'='ADD-ONS'
'make' is the link.
(Other definitions for add-ons that I've seen before include "Accessories" , "Additions" .)