Servant hid bags with mum (8)
I believe the answer is:
handmaid
'servant' is the definition.
(I know that servant can be written as handmaid)
'hid bags with mum' is the wordplay.
'bags' indicates putting letters inside (bag can mean secures or steals).
'with' becomes 'and'.
'mum' becomes 'ma' (ma can mean mother).
'and'+'ma'='andma'
'hid' going around 'andma' is 'HANDMAID'.
(Other definitions for handmaid that I've seen before include "Female attendant" , "Female servant" , "servant - with 2d" .)