Ordering a fancy flower for the border (3,6)
I believe the answer is:
rio grande
'the border' is the definition.
(part of the US-Mexico border)
'ordering a fancy' is the wordplay.
'fancy' is an anagram indicator.
'ordering'+'a'='orderinga'
'orderinga' with letters rearranged gives 'RIO GRANDE'.
'flower for' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for rio grande that I've seen before include "Great river bordering USA and Mexico" , "US-Mexico border river" , "River boundary between the US and Mexico" , "Long river" , "Mexico-USA border" .)