Everyone's cards added to pile, each must make a contribution (3,5,2,4)
I believe the answer is:
all hands on deck
'each must make a contribution' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'everyone's cards added to pile' is the wordplay.
'everyone' becomes 'all' (all people).
'cards' becomes 'deck' (deck of cards).
'added to' is a charade indicator (letters next to each other).
'pile' becomes 'handson' (I can't explain this - if you can you should give a lot more credence to this answer).
'deck' after 'handson' is 'handsondeck'.
'all'+'handsondeck'='ALL HANDS ON DECK'
Can you help me to learn more?
(Other definitions for all hands on deck that I've seen before include "Alert for everyone" , "Order, on board" .)