Sticky exudation from leguminous plants? (3)

I believe the answer is:

gum

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'sticky exudation' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'from leguminous plants?' is the wordplay.
'from' indicates a hidden word.
'GUM' can be found hidden inside 'leguminous plants'.

Can you help me to learn more?

(Other definitions for gum that I've seen before include "A chopper base" , "Gingeva is its technical name" , "Stuff to chew" , "Leaving body" , "Chewed sweet" .)

I've seen this clue in the Evening Standard.

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