Baroque keyboard composition (7)
I believe the answer is:
toccata
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">baroque keyboard composition</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for toccata that I've seen before include "Baroque musical piece" , "Baroque keyboard composition" , "Keyboard composition emphasising technique" , "Noted work" , "Series of musical runs and chords before a fugue" .)