Goes down with many a subscription (4)
I believe the answer is:
dips
'goes down' is the definition.
(dipping is a kind of going down)
'with many a subscription' is the wordplay.
'with' is a charade indicator (letters next to each other).
'many' becomes 'D' (Roman numeral for 500).
'a subscription' becomes 'ips' (I can't justify this - if you can you should believe this answer much more).
'd' next to 'ips' is 'DIPS'.
Can you help me to learn more?
(Other definitions for dips that I've seen before include "Briefly immerses" , "Lowers into liquid" .)