Climate activist's share of meagre takings (5)

I believe the answer is:

greta

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

'climate activist's share' is the definition.
I can't tell whether this definition defines the answer.

'of meagre takings' is the wordplay.
'of' indicates the answer is hidden within the clue.
'GRETA' can be found hidden inside 'meagre takings'.

Can you help me to learn more?

(Other definitions for greta that I've seen before include "Woman" , "Girl" , "'I want to be alone' - ?.. Garbo (5)" , "- Garbo, Swedish actress" , "Miss Garbo" .)

I've seen this clue in The Guardian.

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