This と is a part of adverb, so the word is はっきりと.
There are adverbs with に and と though they can be used without と and に, beside there are some which can be used with both と and に.
Indon't know the specific rules but please take a look at it.
http://www.tjf.or.jp/hidamari/4_mondou/mondou16.html
I hope you get it.
April 25, 2015
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