Something small and round might dash after it outside house? (6)
I believe the answer is:
pebble
'house?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for pebble that I've seen before include "'Small, rounded stone (6)'" , "Small, round stone" , "Small roundish stone" , "Smooth little stone" , "Stone on beach" .)