Device that provides a shuttle service for a seamstress? (6,7)
I believe the answer is:
sewing machine
This clue might be a double definition.
'device that provides a shuttle service' is the first definition.
'sewing machine' can be an answer for 'device' (sewing machine is a kind of device). I'm not sure about the remainder of the definition.
'a seamstress?' is the second definition.
I know that 'seamstress' relates to this answer. I also know that both the answer and definition are singular nouns
'for' is the link.
(Other definitions for sewing machine that I've seen before include "Device for stitching" , "Singer maybe" , "Mechanical stitcher" , "Tailor's item" , "Aid for a seamstress" .)