A collectable dog one comes to love (5)
I believe the answer is:
curio
'a collectable' is the definition.
I can't judge whether this definition defines the answer.
'dog one comes to love' is the wordplay.
'dog' becomes 'cur' (a cur is an aggressive or scruffy dog).
'one' becomes 'i' (Roman numeral).
'comes to' says to put letters next to each other.
'love' becomes 'o' (love means zero in tennis).
'cur'+'i'+'o'='CURIO'
Can you help me to learn more?
(Other definitions for curio that I've seen before include "Something unusual, perhaps worthy of collecting" , "Unusual object, oddity" , "Interesting object of rarity or difference" , "Intriguing object worth collecting" , "odd thing" .)