Yes, shuffle is playable
...and is worth 17 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Shuffle" Definition
noun
A confused mixture; a jumble.
A dance in which the feet slide along or move close to the floor.
A short sliding step or movement, or a walk characterized by such steps.
An evasive or deceitful action; an equivocation.
Games An act of shuffling cards, dominoes, or tiles.
verb-intransitive
Games To mix playing cards, tiles, or dominoes together so as to make their order random.
To act in a shifty or deceitful manner; equivocate.
To dance casually with sliding and tapping steps.
To move about from place to place; shift: shuffled around looking for work.
To move with short sliding steps, without or barely lifting the feet: The crowd shuffled out of the theater.
phrasal-verb
Shuffle off Informal To leave; depart.
Shuffle off To evade or shirk (a responsibility, for example).
Shuffle off To get rid of; dispose of.
verb-transitive
To mix together (playing cards or tiles, for example) so as to make a random order of arrangement.
To move (something) from one place to another; transfer or shift.
To put aside or under cover quickly; shunt: shuffled the bill under a pile of junk mail.
To slide (the feet) along the floor or ground while walking.
verb
To mix in a mass confusedly .
To put or thrust aside or under cover .
To rearrange (as playing cards, dominoes, or tiles) to produce a random order.
To move about, back and forth, or from one place to another .
To move (as the feet) by sliding along or back and forth without lifting.
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