It gives out when pressed in correctly? (9)
I believe the answer is:
dispenser
'it gives out when pressed in correctly?' is the definition.
The definition suggests a singular noun which matches the answer.
This is all the clue.
Can you help me to learn more?
(Other definitions for dispenser that I've seen before include "One filling prescription" , "Chemist" , "ATM" , "Container releasing its contents in prescribed amounts" , "one to give out" .)