Bloomer is in time (5)
I believe the answer is:
daisy
'bloomer' is the definition.
(I know that daisy is a type of bloomer)
'is in time' is the wordplay.
'in' means one lot of letters goes inside another.
'time' becomes 'day' (day is a kind of time).
'is' going within 'day' is 'DAISY'.
(Other definitions for daisy that I've seen before include "Common wild flower" , "Plant; girl's name" , "See 1 Across" , "Grassland flower" , "Common plant" .)