Look out for rival side contracted to serve paperwork (7,8)

'contracted to serve paperwork' is the definition.
I know nothing about this answer so I can't judge whether this works.

'look out for rival side' is the wordplay.
'look out' becomes 'platform' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'for' says to put letters next to each other (I've seen this in other clues).
'rival' becomes 'vie' (vie can mean to rival or struggle).
'side' becomes 'wing' (as in left and right wings).
'vie'+'wing'='viewing'
'platform' after 'viewing' is 'VIEWING PLATFORM'.

Can you help me to learn more?