Loud oral order for flowers (5)
I believe the answer is:
flora
'flowers' is the definition.
(I've seen this in another clue)
'loud oral order' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'order' is an anagram indicator.
'oral' is an anagram of 'lora'.
'f'+'lora'='FLORA'
'for' is the link.
(Other definitions for flora that I've seen before include "Roman goddess of flowers" , "A region's plants" , "Lots of plants" , "Various plants" , "Botanical specimens" .)