Originally, why only men bought action toys - or an animal! (6)
I believe the answer is:
wombat
'an animal' is the definition.
(wombat is a kind of animal)
'originally why only men bought action toys' is the wordplay.
'originally' indicates taking the first letters.
The first letters of 'why only men bought action toys' is 'WOMBAT'.
'or' is the link.
(Other definitions for wombat that I've seen before include "Marsupial of Oz" , "Bear-like marsupial" , "Burrowing animal" , "Australian resident" , "Tailless marsupial down under" .)