Little wriggler wriggling in lead pot (7)
I believe the answer is:
tadpole
'little wriggler' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'wriggling in lead pot' is the wordplay.
'lead pot' can be anagrammed to 'TADPOLE'.
But, I'm not clear how this is indicated.
Can you help me to learn more?
(Other definitions for tadpole that I've seen before include "young swimmer" , "Embryonic frog" , "To plead for tiny frog" , "Immature amphibian" , "Pre-frog form" .)