Crossword Genius

Old American tanks housing university fish collection (10)

Ross

I believe the answer is:

oceanarium

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'fish collection' is the definition.
The definition suggests a singular noun which matches the answer.

'old american tanks housing university' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'tanks' indicates an anagram (tank can mean to fail or go wrong).
'housing' indicates putting letters inside.
'university' becomes 'u' (abbreviation for university).
'o'+'american'='oamerican'
'oamerican' is an anagram of 'oceanarim'.
'oceanarim' enclosing 'u' is 'OCEANARIUM'.

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I've seen this clue in The Sunday Times.
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