Foreign girl tries on a new design (8)
I believe the answer is:
senorita
'foreign girl' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'tries on a new design' is the wordplay.
'a new' indicates anagramming the letters.
'design' becomes 'a' (I am not sure about this - if you are sure you should believe this answer much more).
'tries'+'on'='trieson'
'trieson' is an anagram of 'senorit'.
'senorit'+'a'='SENORITA'
Can you help me to learn more?
(Other definitions for senorita that I've seen before include "miss from Valencia" , "Notaries surrond Spanish girl" , "Abroad, miss" , "Young lady of Spain" , "Treason I commit for young Spanish woman" .)