It's a funny sort of fence (2-2)

I believe the answer is:

ha-ha

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This clue could be a double definition.

'it's a funny' is the first definition.

'sort of fence' is the second definition.
'ha-ha' can be an answer for 'fence' (I have seen 'Sunken fence' mean 'ha-ha' so perhaps 'fence' could also mean 'ha-ha'). I'm not sure about the 'sort of' bit.

Can you help me to learn more?

(Other definitions for ha-ha that I've seen before include "Ditch with wall in it - sounds merry" , "Feature of posh garden" , "Hidden ditch" , "Kind of ditch with wall in it" , "Loud laugh" .)

I've seen this clue in the Evening Standard.

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