Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
There's a tall dude trying to sell you something really expensive. He's really going off on how great this item is and how you should buy it. This guy is a real salesman. A real talker (たか).
This restaurant is expensive, but delicious.
That is too high for me to reach, so I've brought James Stewart, who is very tall, down from Heaven.
Why are suits from the "Big and Tall" store so expensive?