Not sure if i rally understand the question and answer. It was my understanding that the order of play is
A- play a clue card
B ATV movement (3 legs)
On that basis, you can play your clue card (A) then carry out the ATV movement phase (B) to claim your treasure, if within reach. Thusyou dont need an amulet. If the treasure is out of reach then you can use an amulet for an extra ATV movement to reach the treasure and claim.
Sorry, this is incorrect. You get to do either A or B on your turn. So even if you played a clue card to narrow the treasure down to the spot next to you, you'd need to use an amulet to get there (or wait until your next turn).
The games becomes much more tense when you can only do one!