Room for experimentation in Bela Bartok (3)

I believe the answer is:

lab

'room for experimentation' is the definition.

'in bela bartok' is the wordplay.
'in' says the answer is hidden in the clue.
'LAB' can be found hidden inside 'bela bartok'.

(Other definitions for lab that I've seen before include "In brief, a room for scientific experiments" , "Research workroom" , "Experimental facility" , "Scientific research space, in short" , "biology classroom?" .)

I've seen this clue in The Sun.

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