### Clue: Stumble and trip (6)
### Answer: ERRANT 
 ### Explanation: Definition: Stumble,trip
  Double defn: 1st: Deviating from the proper course,erring – Sir Lancelot was an errant knight for being intimate with his (or rather, Arthur's) Queen; and 2nd: Journeying in a quest of adventure – the very same Sir Lancelot was a knight errant searching for the Holy Grail.  Another mismatch in that the answer is an adjective, whilst the definitions in the clues can only be verbs or nouns.  Edit.note: Apologies to all (including setter) for my mistake – I was hung up on it being a double definition, misdirected by the conjunction.  Thanks to George  and , the correct answer is ERR(stumble) + AND – a trip to do a chore.  A compact little clue that can really make a solver like me trip and stumble!