Clue: One could get fleeced here in court — lawyers principally stick together (4,6)
Answer: WOOL-STAPLE
Explanation: Definition: One could get fleeced here
WOO (to court) + L[awyers] + STAPLE (to stick together) – it's "a market where wool is sold" (given as two words in Chambers); "staple" here is related to "stable", meaning it was a fixed market