Fight after second old person gets public platform (7)
I believe the answer is:
soapbox
'public platform' is the definition.
'soapbox' can be an answer for 'platform' (soapbox is a kind of platform). I am unsure of the 'public' bit.
'fight after second old person' is the wordplay.
'fight' becomes 'box' (boxing is a kind of fighting).
'after' says to put letters next to each other.
'second old person' becomes 'soap' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'box' after 'soap' is 'SOAPBOX'.
'gets' is the link.
Can you help me to learn more?
(Other definitions for soapbox that I've seen before include "Platform for airing one's views?" , "Rostrum to speak from" , "Stand on it and declaim" , "Make-shift stand for street orator" , "Public speakers may stand on this" .)