Crossword Genius

Lively people are full of them (5)

Ross

I believe the answer is:

beans

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

'lively people' is the definition.
The definition and answer can be both body parts as well as being plural nouns.
Maybe there's an association between them I don't understand?

'are full of them' is the wordplay.
I cannot quite see how this works, but
'are' could be 'a' (short for 'are', historical unit of measurement) and 'a' is found in the answer.
The remaining letters 'bens' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for beans that I've seen before include "Edible kidney-shaped seeds" , "Haricots for instance" , "nuts" , "Pulses, tomato sauce and grilled bread" , "Haricots, e.g." .)

I've seen this clue in The Mirror.
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