One who throws out a safety seat (7)
I believe the answer is:
ejector
This clue could be a double definition.
'one who throws out' is the first definition.
(someone who ejects or throws others out)
'a safety seat' is the second definition.
'ejector' can be an answer for 'seat' (ejector seat is a kind of seat). I am not certain of the 'a safety' bit.
Can you help me to learn more?
(Other definitions for ejector that I've seen before include "One violently forcing out" , "Something that throws out violently" , "Discharging device" , "Something or someone that throws out" , "A bouncer" .)