Crossword Genius

This opal's no good for institutions (9)

Ross

I believe the answer is:

hospitals

'institutions' is the definition.
(I have seen 'Medical institutions ' mean 'hospitals' so perhaps 'institutions' could also mean 'hospitals')

'this opal's no good' is the wordplay.
'no good' indicates an anagram (no good can mean faulty or defective).
'this'+'opals'='thisopals'
'thisopals' anagrammed gives 'HOSPITALS'.

'for' acts as a link.

(Other definitions for hospitals that I've seen before include "Lost aphis found in health centres" , "Medical institutions" , "Buildings with wards" , "Infirmaries" .)

I've seen this clue in the Sydney Morning Herald.
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