Back legs tame animal bit (7)
I believe the answer is:
snippet
'bit' is the definition.
(I've seen this in another clue)
'back legs tame animal' is the wordplay.
'back' says the letters should be written in reverse.
'legs' becomes 'pins' (pin is a kind of leg).
'tame animal' becomes 'pet' (pet is a kind of animal. I am not sure about the 'tame' bit.).
'pins' written backwards gives 'snip'.
'snip'+'pet'='SNIPPET'
Can you help me to learn more?
(Other definitions for snippet that I've seen before include "Scrap (of information, news etc)" , "Brief extract" , "A cutting" , "A small piece cut off" , "Short extract" .)