Make sense of a theologian at college (3,2)
I believe the answer is:
add up
'make sense' is the definition.
('add up' can be a synonym of 'make sense')
'a theologian at college' is the wordplay.
'theologian' becomes 'dd' (Doctor of Divinity degree).
'at college' becomes 'up'.
'a'+'dd'+'up'='ADD UP'
'of' is the link.
(Other definitions for add up that I've seen before include "Seem to be sensible" , "tot" , "Aggregate, get total" , "Do sums" , "Seem consistent or reasonable - arithmetically?" .)