Pure-bred poodle outside with princess, most welcome! (8)
I believe the answer is:
pedigree
'pure-bred poodle outside' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?
'with princess most welcome' is the wordplay.
'with' is a charade indicator (letters next to each other).
'princess' becomes 'pedi' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'most' means to remove the last letter.
'welcome' becomes 'greet' (to greet someone is to welcome them).
'greet' with its last letter taken off is 'gree'.
'pedi' put next to 'gree' is 'PEDIGREE'.
Can you help me to learn more?
(Other definitions for pedigree that I've seen before include "(Pure) ancestry" , "(Distinguished) lineage" , "Record of descent" , "Lineage, ancestry" , "Pure lineage" .)