don't worry bro,your clownfish is probably still acclimatising, give yourself some time and let nature takes its course. The clownfish will come to know of the anemone.
but there are also some factors to take note: what anemone do you have? if its those anemone with a long body, from my experience, clowfishes doesn't like those. I don't know why either. All of them squeezed into one sebae anemone
just my 2cents and good luck