Fast mover, one on the fiddle by the sound of it? (7)
I believe the answer is:
cheetah
'the sound of it?' is the definition.
I can't tell whether this definition defines the answer.
'fast mover one on the fiddle' is the wordplay.
'fast mover' becomes 'che' (I can't explain this - if you can you should believe this answer much more).
'one' becomes 'a'.
'on' means one lot of letters goes inside another.
'fiddle' indicates anagramming the letters.
'the' anagrammed gives 'eth'.
'a' inserted inside 'eth' is 'etah'.
'che'+'etah'='CHEETAH'
'by' is the link.
Can you help me to learn more?
(Other definitions for cheetah that I've seen before include "Long-legged feline" , "quickie?" , "Swift, spotted feline" , "Swift predator" , "fast runner" .)