Instrument for viewing internal body parts (9)
I believe the answer is:
endoscope
'instrument for viewing internal body parts' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for endoscope that I've seen before include "Instrument for viewing internal body parts" , "medical device" , "medical probe" , "Medical instrument" , "Instrument for viewing internal body cavities and organs" .)