What is the best way to respond to this pincer joseki deviation?
White's connection and pincer sequence in another answer works well only if White has a stone (or stones) around the star point D16 in the upper left corner. Then, the 7th stone on J16 is both a pincer and an extension.

$$Wcm1 Good for W
$$ +-------------------+
$$ |...................|
$$ |...................|
$$ |...........2.1.....|
$$ |...O....7,..45.X...|
$$ |...........a.3.....|
$$ |...........8....6..|
$$ |.............9.....|
$$ |...................|
$$ |...................|
$$ |...,.....,.....,...|


On the other hand,

$$Wcm1 Bad for W
$$ +-------------------+
$$ |...................|
$$ |...................|
$$ |......0....2.1.....|
$$ |...X....7,..45.X...|
$$ |...........a.3.....|
$$ |...........8....6..|
$$ |.............9.....|
$$ |...................|
$$ |...................|
$$ |...,.....,.....,...|


Otherwise, White should invade the upper right corner at the 3-3 point, r17 with move 5. If Black blocks at r 16, White will connect this stone to the kakari stone.

More likely, Black will block at Q17. This captures the kakari stone on O17, but Black's stones are overconcentrated.

$$Wcm1 B is overconcentrated. W is free to play at A or tenuki.
$$ +-------------------+
$$ |...................|
$$ |..............657..|
$$ |...........X.O821..|
$$ |...X.....,..X..X3..|
$$ |.............O.4...|
$$ |................9..|
$$ |...................|
$$ |...................|
$$ |...................|
$$ |...,.....,.....,...|


Either way, the White stone on O15 remains "loose," and in a position to cancel Black's outside influence.