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Unknown fish bones may appear in this (1-3)

Ross

I believe the answer is:

x-ray

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'bones may appear in this' is the definition.
The definition suggests a singular noun which matches the answer.

'unknown fish' is the wordplay.
'unknown' becomes 'x' (algebra).
'fish' becomes 'ray' (ray is a kind of fish).
'x'+'ray'='X-RAY'

Can you help me to learn more?

(Other definitions for x-ray that I've seen before include "Radiogram" , "Electromagnetic photograph" , "Medical photo" , "Internal "photo"" , "Radiation photograph" .)

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