Hurriedly (2,5)
I believe the answer is:
in haste
'hurriedly' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for in haste that I've seen before include "Rashly (how not to marry?)" , "Rushing round" , "Hurriedly" , "Rapidly" , "''Marry . . . . . . ., repent at leisure'' (2, 5)" .)