Yes, tidy is a Scrabble word!
...and is worth 8 points in Scrabble, and 7 points in Words with Friends
tidy
Verb
1. Put (things or places) in order
Adjective
1. Marked by order and cleanliness in appearance or habits
2. (of hair) neat and tidy
3. Large in amount or extent or degree
Noun
1. Receptacle that holds odds and ends (as sewing materials)
What Scrabble words can I make with the letters in tidy?
3 Letter Words
2 Letter Words