Condescend to accept student’s first plan (6)
I believe the answer is:
design
'plan' is the definition.
(design is a kind of plan)
'condescend to accept student's first' is the wordplay.
'condescend' becomes 'deign' ('deign' can be a synonym of 'condescend').
'to accept' means one lot of letters goes inside another.
'first' says to take the initial letters.
The initial letter of 'students' is 's'.
'deign' going around 's' is 'DESIGN'.
(Other definitions for design that I've seen before include "Preliminary sketch or plan" , "Devise, create, make out a plan" , "Plot" , "Aim -- decorative pattern" , "Provide blueprint" .)