Object to hush in seedy place? Quickly drink up (7)
I believe the answer is:
earplug
'object to hush in seedy' is the definition.
I can't judge whether this defines the answer.
'place? quickly drink up' is the wordplay.
'place? quickly' becomes 'ear' (I can't justify this - if you can you should give a lot more credence to this answer).
'drink' becomes 'gulp' (gulping is a kind of drinking).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'gulp' reversed gives 'plug'.
'ear'+'plug'='EARPLUG'
Can you help me to learn more?
(Other definitions for earplug that I've seen before include "Noise protector" , "Personal defence against noise (or water)" , "Noise excluder" , "Lug blocker" , "Noise defender" .)