Jump over queen's spaniel (8)
I believe the answer is:
springer
'spaniel' is the definition.
(I know that springer is a type of spaniel)
'jump over queen's' is the wordplay.
'jump' becomes 'spring' (springing is a kind of jumping).
'over queen' becomes 'er' (short for Elizabeth Regina ie Queen Elizabeth. I am not sure about the 'over' bit.).
'spring'+'er'='SPRINGER'
Can you help me to learn more?
(Other definitions for springer that I've seen before include "Kind of spaniel" , "A bounder" , "Large spaniel with wavy silky coat" , "Game dog" , "Shown [AT CRUFTS]" .)