Lovely hedgehog capable of great speed (10)
I believe the answer is:
supersonic
'lovely' is the definition.
Both the answer and definition are adjectives. Perhaps they are linked in a way I don't understand?
'hedgehog capable of great speed' is the wordplay.
I cannot really understand how this works, but
'hedgehog' could be 'sonic' (I've seen this before) and 'sonic' is present in the answer.
'great' could be 'super' (both can mean excellent) and 'super' is found in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for supersonic that I've seen before include "moving very fast" , "Faster than Mach 1" , "Very fast - 11 (anag)" , "Faster than the speed of sound" .)