Happen again (5)
'happen again' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for recur that I've seen before include "Happen again (5)" , "Perseverate" , "expected to return" , "Happen repeatedly" , "Come round again" .)
'happen again' is the definition.
('occur' can be a synonym for 'happen' so perhaps 'reoccur' is OK for 'happen again')
This is all the clue.
(Other definitions for reoccur that I've seen before include "Come again?" , "make comeback" , "Happen again" .)