Crossword Genius

Mirrored solar device at hotel is unconventional (9)

Ross

I believe the answer is:

heliostat

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'mirrored solar device' is the definition.
The definition suggests a singular noun which matches the answer.

'at hotel is unconventional' is the wordplay.
'unconventional' indicates anagramming the letters.
'at'+'hotel'+'is'='athotelis'
'athotelis' with letters rearranged gives 'HELIOSTAT'.

Can you help me to learn more?

(Another definition for heliostat that I've seen is " instrument with mirror".)

I've seen this clue in The Hindu.
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