Came about supporting husband dismissed from the plant (3,4)
I believe the answer is:
tea rose
'plant' is the definition.
The answer is an example.
'came about supporting husband dismissed from the' is the wordplay.
'came about' becomes 'arose' (arise can mean to occur or come about).
'supporting' means one lot of letters go next to another (in a down clue, some letters go below others).
'husband' becomes 'h'.
'dismissed from' suggests deleting specific letters.
'the' with 'h' taken away is 'te'.
'arose' after 'te' is 'TEA-ROSE'.
(Other definitions for tea rose that I've seen before include "Eats roe (anag.)" , "Garden plant" , "Flowering bush" , "Bloom" , "Scented garden flower" .)