Possible dessert is hot? That’s silly (7)

I believe the answer is:

foolish

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

'silly' is the definition.
(I know that silly can be written as foolish)

'possible dessert is hot?' is the wordplay.
'possible dessert' becomes 'fool' (type of dessert. I am not sure about the 'possible' bit.).
'hot?' becomes 'h' (abbreviation eg on taps).
'fool'+'is'+'h'='FOOLISH'

'that's' is the link.

Can you help me to learn more?

(Other definitions for foolish that I've seen before include "Imprudent" , "Not very bright" , "Idiotic" , "Silly, unwise" , "Half-baked" .)

I've seen this clue in The Times.

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