quid pro quo

BARTER
List of words for the clue quid pro quo from the crossword:
SWAP SWAPS TRADE SWOP RETAINER CONSIDERATION INTERCHANGE EXCHANGE AMISS REDS ARENA NERO CHAW CHEW STATUS CPA EMIL POUND ASIS
WordClue
UPSIDEpro, plus
ADVANTAGEpro, upside
MERCURYquicksilver, hydrargyrum
MUMBLEquiet or unintelligible vocalization