Little Jeremy Fisher story about day pond half disappeared (7)
I believe the answer is:
tadpole
'little jeremy fisher story' is the definition.
I can't judge whether this defines the answer.
'about day pond half disappeared' is the wordplay.
'about' means one lot of letters goes inside another.
'day' becomes 'd' (abbreviation for day).
'half' suggests halving the letters.
'disappeared' becomes 'tale' (I can't explain this - if you can you should give a lot more credence to this answer).
'pond' with half the letters taken is 'po'.
'd'+'po'='dpo'
'dpo' going within 'tale' is 'TADPOLE'.
Can you help me to learn more?
(Other definitions for tadpole that I've seen before include "Immature toad or frog" , "Frog in the making" , "Legless creature" , "wriggler?" , "Pre-frog form" .)