A measure of speed I built initially on northbound A1 (frog and toad?) (8)
I believe the answer is:
amphibia
'built initially on northbound a1 frog and toad?' is the definition.
I can't tell whether this defines the answer.
'a measure of speed i' is the wordplay.
'a' becomes 'amp' (A is the symbol for the amp or ampere).
'measure' becomes 'H' (H is an example).
'of speed' becomes 'ibi' (I can't explain this - if you can you should believe this answer much more).
'i' becomes 'a'.
'amp'+'h'+'ibi'+'a'='AMPHIBIA'
Can you help me to learn more?
(Other definitions for amphibia that I've seen before include "It's used in cheesemaking" , "class, naturally" , "They're born swimmers" , "Cold-blooded types" , "Class of frogs, toads, etc" .)
