Yes, crack is playable
...and is worth 15 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Crack" Definition
noun
A breaking, harshly dissonant vocal tone or sound, as in hoarseness.
A mental or physical impairment; a defect.
A moment; an instant: at the crack of dawn.
A partial split or break; a fissure.
verb-intransitive
Chemistry To break into simpler molecules by means of heat.
To break without complete separation of parts; fissure: The mirror cracked.
To change sharply in pitch or timbre, as from hoarseness or emotion. Used of the voice.
To have a mental or physical breakdown: cracked under the pressure.
phrasal-verb
Crack down To act more forcefully to regulate, repress, or restrain: The police cracked down on speeding.
Crack up Informal To experience or cause to experience a great deal of amusement: really cracked up when I heard that joke.
Crack up Informal To have a mental or physical breakdown: crack up from overwork.
Crack up Informal To praise highly: He was simply not the genius he was cracked up to be.
Crack up To damage or wreck (a vehicle or vessel): crack up a plane; crack up a boat.
adjective
Excelling in skill or achievement; first-rate: a crack shot; a crack tennis player.
Of superior excellence or ability .
verb-transitive
Informal To break open or into: crack a safe.
Informal To break through (an obstacle) in order to win acceptance or acknowledgement: finally cracked the "men-only” rule at the club.
Informal To open up for use or consumption: crack a book; cracked a beer.
Informal To tell (a joke), especially on impulse or in an effective manner.
To break with a sharp snapping sound. See Synonyms at break.
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