Clue: Unreliable type made bankrupt by necessity? About right (6,4)
Answer: BROKEN REED
Explanation: Definition: Unreliable type
 BROKE(bankrupt/unable to pay one's debts) **plus**(by) NEED(a necessity/a requirement) **containing**(About) R(abbrev. for "right").
Answer: …/one you cannot rely on for support.