Too strange to take seriously? (5)

I believe the answer is:

funny

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'too strange' is the definition.
'funny' can be an answer for 'strange' (synonyms). I'm unsure of the 'too' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for funny that I've seen before include "Droll -- suspicious" , "Amusing or peculiar" , "Comical" , "Strange; comic" , "Hilarious" .)

I've seen this clue in the Evening Standard.

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