Cow kept by aged auntie (5)
I believe the answer is:
daunt
'cow' is the definition.
(I've seen this before)
'kept by aged auntie' is the wordplay.
'kept by' indicates the answer is hidden within the clue.
'DAUNT' can be found hidden inside 'aged auntie'.
(Other definitions for daunt that I've seen before include "Make (someone) apprehensive" , "Frighten, intimidate" , "Make to feel intimidated" , "Discourage" , "Scare off - dismay" .)