If short of a full team you can borrow from another team that plays that night and must play at a wing only (WA/WD).
No team can use a borrowed player and stand down a registered player to the sideline.
A club cannot proactively use this rule due to the club player rules superceding this (please see this rule). If a club player plays up within the club they cannot then be borrowed as it is not their official playing night.
(For reference - Club rules - a player can only play up 4 times within their club. After the 4th time they can only play for their original registered team. Club players cannot be played down divisions from their registered team.)