Flower is squashed in time (5)
I believe the answer is:
daisy
'flower' is the definition.
(I know that daisy is a type of flower)
'is squashed in time' is the wordplay.
'squashed in' means one lot of letters goes inside another (I've seen this in other clues).
'time' becomes 'day' (day is a kind of time).
'is' going inside 'day' is 'DAISY'.
(Other definitions for daisy that I've seen before include "Common wild flower" , "Flower of lawn and meadow" , "Composite" , "bloomer" , "girl" .)