#2: IMP Pairs, Reno Regional, 1992

Contract: 4♠ by West
Opening Lead: ♦J

You cover with the ♦Q, and take south's king with your ace.  It seems straightforward to try to dispose of the diamond loser; so you cash two clubs and lead a spade to the ace, as the opponents contribute the six and seven.  Both defenders follow suit again when you play off the club king, discarding the diamond.

What now?