Pragmatic sort on a roll (7)
I believe the answer is:
realist
'pragmatic sort' is the definition.
(I've seen this in another clue)
'on a roll' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'roll' becomes 'list' (list can mean to lean or roll).
're'+'a'+'list'='REALIST'
(Other definitions for realist that I've seen before include "One who faces things as they are" , "One has no fancy ideas" , "One with a pragmatic attitude" , "Plato, for example" , "Saltier (anag.)" .)