That of frogs, or a swan swimming around softly? (5)
I believe the answer is:
spawn
'that of frogs' is the definition.
I can't judge whether this definition defines the answer.
'a swan swimming around softly?' is the wordplay.
'swimming' indicates an anagram (letters swim around into a new order).
'around' indicates putting letters inside.
'softly?' becomes 'p' (short for piano, musical term for softly).
'swan' anagrammed gives 'sawn'.
'sawn' going around 'p' is 'SPAWN'.
'or' acts as a link.
Can you help me to learn more?
(Other definitions for spawn that I've seen before include "Deposit mass of eggs" , "Generate; fish eggs" , "Eggs of fish, frogs, etc" , "Mass of fish eggs" , "(Of fish) release eggs" .)