Earthenware revealing animal in extremes of play (7)
I believe the answer is:
pottery
'earthenware' is the definition.
(thesaurus)
'animal in extremes of play' is the wordplay.
'animal' becomes 'otter' (I've seen this before).
'in' is an insertion indicator.
'extremes of' says to hollow out the word (remove centre letters).
'play' with its centre taken out is 'py'.
'otter' placed inside 'py' is 'POTTERY'.
'revealing' acts as a link.
(Other definitions for pottery that I've seen before include "Ceramics factory" , "Items made from clay" , "China, for example" , "Clayware" , "Earthenware" .)