The part of the Court occupied by the lawyers.
To get a man's head into chancery
is to get it under your arm, where you can pummel it as long as you
like, and he cannot get it free without great difficulty. The allusion
is to the long and exhausting nature of a Chancery suit. If a man once
gets his head there, the lawyers punish him to their heart's content.
“When I can perform my mile in eight minutes, or a little less, I
feel as if I had old Time's head in chancery.” —Holmes: Autocrat,
chap. vii. p. 191.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894