Answer For Meaning

(transitive) To vouch for (someone); to attest to the character of (someone).

Example: Used other than as an idiom: see answer,‎ for.
  I don't know the answer to that, so I'm going to let my lawyer answer for me.
  The mayor wil be answering for his crimes for many years.
2007 September, Wilson D Miscamble, “The Faculty 'Problem'”, America, volume 197, number 6, page 26:
  Duffy dared to think that Queen Elizabeth I has a few things for which to answer
  I will answer for his debt, if he can't pay on the day.
  She's known me for years, and she's always answered for me!.