Mother initially taking lock of hair from part of bed (8)
I believe the answer is:
mattress
'part of bed' is the definition.
(I know that mattress is part of bed)
'mother initially taking lock of hair' is the wordplay.
'mother' becomes 'ma' (ma can mean mother).
'initially' suggests taking the first letters.
'lock of hair' becomes 'tress' (I've seen this before).
The initial letter of 'taking' is 't'.
'ma'+'t'+'tress'='MATTRESS'
'from' is the link.
(Other definitions for mattress that I've seen before include "Palliasse" , "Flat sleeping pad" , "Pad to sleep on" , "Nap on this" , "Padded part of a bed" .)