Mouse taken as a tease (6)
I believe the answer is:
mickey
I believe this clue is a double definition.
'mouse' is the first definition.
(as in Mickey Mouse)
'taken as a tease' is the second definition.
(as in taking the mickey)
(Other definitions for mickey that I've seen before include "- Finn; - Mouse" , "To take the - is to ridicule or tease someone" , "Walt Disney creation" , "Doctored drink" , "Disney mouse" .)