Flower one caught in important date (5)
I believe the answer is:
erica
'flower' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'one caught in important date' is the wordplay.
'one' becomes 'i' (Roman numeral).
'caught' becomes 'c' (cricket abbreviation).
'in' means one lot of letters goes inside another.
'important date' becomes 'era' (I've seen this before).
'i'+'c'='ic'
'ic' going inside 'era' is 'ERICA'.
Can you help me to learn more?
(Other definitions for erica that I've seen before include "I care (anag) - plant - girl" , "Heather's Latin name?" , "hardy shrub" , "found on the moors" , "Heath genus; girl's name" .)