Party animal (4)

I believe the answer is:

stag

I believe this is a double definition.

'party' is the first definition.
(stag party is a kind of party)

'animal' is the second definition.
(stag is a kind of animal)

(Other definitions for stag that I've seen before include "American party" , "Game - speculator" , "animal of the deer family" , "Unaccompanied man at party" , "Horned animal" .)

I've seen this clue in The Mirror, The Guardian, The Daily Express and The Telegraph.

Want a hint initially instead of a full solution? Install my app