Put aside silly thoughts (5)

I believe the answer is:

ideas

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'thoughts' is the definition.
(idea is a kind of thought)

'put aside silly' is the wordplay.
'aside' anagrams to 'IDEAS'.
But, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for ideas that I've seen before include "thinking" , "Thoughts from Sadie" , "Aside (anag.)" , "Thoughts or opinions" , "Fancies" .)

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

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