Daisy is missing for a time (3)
I believe the answer is:
day
'a time' is the definition.
(day is a kind of time)
'daisy is missing' is the wordplay.
'missing' indicates named letters should be taken away.
'daisy' with 'is' taken out is 'DAY'.
'for' is the link.
(Other definitions for day that I've seen before include "Particular date" , "Period of time" , "Born yesterday" , "Unit of time" , "24 hour period" .)