Enrol strangely solitary sort (5)
I believe the answer is:
loner
'solitary sort' is the definition.
(I've seen this in another clue)
'enrol strangely' is the wordplay.
'strangely' indicates anagramming the letters.
'enrol' anagrammed gives 'LONER'.
(Other definitions for loner that I've seen before include "One preferring own company" , "He's not a joiner" , "Solitary type" , "One lacking friends" , "Solitary individual, prefers own company" .)