Individual investment ultimately college must attract (4)
I believe the answer is:
unit
'individual' is the definition.
(I've seen this in other clues)
'investment ultimately college must attract' is the wordplay.
'ultimately' suggests the final letters.
'college' becomes 'uni' (short for university).
'must attract' means one lot of letters go next to another.
The last letter of 'investment' is 't'.
't' after 'uni' is 'UNIT'.
(Other definitions for unit that I've seen before include "Group that's part of a larger organisation" , "Entity, system; component group" , "Single item, maybe part of a set" , "Individual item" , "- - trust" .)