Design for college is set in stone (7)
I believe the answer is:
project
'design' is the definition.
(I know that design can be written as project)
'for college is set in stone' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'college' becomes 'c'.
'is set in' indicates putting letters inside.
'stone' becomes 'jet' (gemstone).
'c' going inside 'jet' is 'ject'.
'pro'+'ject'='PROJECT'
(Other definitions for project that I've seen before include "Planned enterprise" , "Scheme, hurl" , "Scheme - stick out!" , "Enterprise, undertaking" , "Throw out, school work" .)