Happen again (5)
'happen again' is the definition.
(I've seen this before)
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 the entire clue.
(Other definitions for reoccur that I've seen before include "Come again?" , "make comeback" , "Happen again" .)