Scrabble Dictionary

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Yes, sustained is playable

...and is worth 12 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Sustained" Definition

adjective

Held at a certain pitch.
Source: Wiktionary
Held continuously at a certain level.
Source: Wiktionary
Continuing for an extended period or without interruption.

verb

Simple past tense and past participle of sustain.
Source: Wiktionary