Place for first flowers presumably is in March (8)
I believe the answer is:
paradise
'place for first flowers presumably' is the definition.
'is in march' is the wordplay.
'in' means one lot of letters goes inside another.
'march' becomes 'parade' (parading is a kind of marching).
'is' inserted inside 'parade' is 'PARADISE'.
(Other definitions for paradise that I've seen before include "perfectly happy state" , "Scene of bliss" , "Happiness" , "Heaven; Eden" , "What was lost to the poet" .)