Extremely tender animal's foot (7)
I believe the answer is:
trotter
'foot' is the definition.
(trotter is a kind of foot)
'extremely tender animal's' is the wordplay.
'extremely' says to hollow out the word (remove centre letters).
'animal' becomes 'otter' (I've seen this before**).
'tender' with its middle taken out is 'tr'.
'tr'+'otter'='TROTTER'
(Other definitions for trotter that I've seen before include "Foot of pig" , "Food for man" , "bit of a pig" , "Steady horse; pig's foot" , "Pig's foot - type of racing horse" .)