Definitions of subclause
(UK) a smaller part of a clause in a bill being considered by Parliament. The subclauses will become subsections if the bill becomes an act (=law)
The plan to allow immigration officers and police to demand an identity card is hidden in a subclause of the draft bill.
a section of a clause in a bill, law, treaty, or contract found within a larger section of that bill, law, treaty, or contract
The meaning of the rule was never specified by European Union law but was a Czech interpretation of a subclause.