Fine plan, regularly collecting cash for floral ornament (7)

'floral ornament' is the definition.
(flower-shaped decoration)

'fine plan regularly collecting cash' is the wordplay.
'fine' becomes 'f' (abbreviation).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'collecting' means one lot of letters goes inside another.
'cash' becomes 'euro' (currency of the Eurozone).
The alternating letters of 'plan' are 'ln'.
'ln' enclosing 'euro' is 'leuron'.
'f'+'leuron'='FLEURON'

'for' acts as a link.