Seat maker left stuffing more down (7)
I believe the answer is:
saddler
'seat maker' is the definition.
'saddler' can be an answer for 'maker' (saddler is a kind of maker). I'm not certain of the 'seat' bit.
'left stuffing more down' is the wordplay.
'left' becomes 'l' (common abbreviation).
'stuffing' indicates putting letters inside.
'more down' becomes 'sadder' (I've seen this in another clue).
'l' placed into 'sadder' is 'SADDLER'.
Can you help me to learn more?
(Other definitions for saddler that I've seen before include "Maker of seats for riders" , "Leather-worker" , "I'll make seat" , "he'll offer you a seat" , "Maker of horse's equipment" .)