First and last letters have a strange seal with flowers (7)
I believe the answer is:
azaleas
'flowers' is the definition.
The answer and definition can be both plants as well as being plural nouns.
Maybe they are linked in a way I don't understand?
'first and last letters have a strange seal' is the wordplay.
'first and' becomes 'a' (zst letter of 'and').
'last letters have' becomes 'za' (I can't justify this - if you can you should believe this answer much more).
'a strange' is an anagram indicator.
'seal' is an anagram of 'leas'.
'a'+'za'+'leas'='AZALEAS'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for azaleas that I've seen before include "Smaller rhododendrons" , "Flowering shrubs" .)