Small animal with broken leg in mine (6)
I believe the answer is:
piglet
'small animal' is the definition.
'piglet' can be an answer for 'animal' (piglet is a kind of animal). I am not sure about the 'small' bit.
'broken leg in mine' is the wordplay.
'broken' indicates an anagram.
'in' is an insertion indicator.
'mine' becomes 'pit' (down the pit).
'leg' with letters rearranged gives 'gle'.
'gle' placed inside 'pit' is 'PIGLET'.
'with' is the link.
Can you help me to learn more?
(Other definitions for piglet that I've seen before include "One with home in Hundred Acre Wood" , "Young porker" , "Friend of Pooh" , "Young farm animal" , "One of Christopher Robin's animals" .)