Yes, edge is playable
...and is worth 7 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Edge" Definition
noun
A dividing line; a border: a house on the edge of town. See Synonyms at border.
A margin of superiority; an advantage: a slight edge over the opposition.
A penetrating, incisive quality: "His simplicity sets off the satire, and gives it a finer edge” ( William Hazlitt).
A provocative or discomforting quality, as from audacity or innovativeness: "Over all, the show will have a grittier edge” ( Constance C.R. White).
A rim or brink: the edge of a cliff.
idiom
On edge Highly tense or nervous; irritable.
On the edge In a precarious position.
On the edge In a state of keen excitement, as from danger or risk: "the excitement of combat, of living on the edge” ( Nelson DeMille).
verb-transitive
To act as or be an edge of: bushes that edged the garden path.
To advance or push slightly or gradually: The dog edged the ball with its nose.
To give an edge to (a blade); sharpen.
To put a border or edge on: edged the quilt with embroidery.
To surpass or beat by a small margin. Often used with out: The runner edged her opponent out at the last moment.
verb-intransitive
To move gradually or hesitantly: The child edged toward the door.
verb
To move or force gradually .
To incline (a ski) sideways so that one edge cuts into the snow.
To defeat by a small margin .
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