Spring three ways (It's what a frog does) (6)
I believe the answer is:
spawns
'does' is the definition.
(spawning is a kind of doing)
'spring three ways' is the wordplay.
'spring' becomes 'spa' (spa can mean a mineral spring).
'three ways' becomes 'wns' (compass directions).
'spa'+'wns'='SPAWNS'
'it's what a frog' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for spawns that I've seen before include "Deposits eggs like fish or frogs." , "produces offspring" , "Makes large numbers" , "Leads to man" , "Of fish, lays eggs" .)