Crossword Genius

No one knows a terrible place for tropical birds, according to Spooner (3,3,4)

Ross

I believe the answer is:

who can tell

I'm a little stuck... Click here to teach me more about this clue!

'no one knows' is the definition.

'a terrible place for tropical birds according to spooner' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is found in the answer.
'place' could be 'tell' (telling is a kind of placing) and 'tell' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Independent.
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