Members of kingdom are amusing Joe (5)

I believe the answer is:

fungi

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'members of kingdom' is the definition.
'Fungi' can be an answer for 'kingdom' (Fungi is an example). I am not certain of the 'members of' bit.

'amusing joe' is the wordplay.
'amusing' becomes 'fun' (synonyms).
'joe' becomes 'GI' (GI Joe).
'fun'+'gi'='FUNGI'

'are' is the link.

Can you help me to learn more?

(Other definitions for fungi that I've seen before include "rusts?" , "Mushrooms, toadstools etc (5)" , "life in woodland?" , "woodland feature" , "Spore producers" .)

I've seen this clue in The Times.

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