Earnestly ask about home for creature (5)

I believe the answer is:

being

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'for creature' is the definition.
(thesaurus)

'earnestly ask about home' is the wordplay.
'earnestly ask' becomes 'beg' (begging is a kind of asking. I am not sure about the 'earnestly' bit.).
'about' is an insertion indicator.
'home' becomes 'in' ('he's home' can mean 'he's in').
'beg' going around 'in' is 'BEING'.

Can you help me to learn more?

(Other definitions for being that I've seen before include "Person" , "Human, perhaps" , "See 9" , "Existing" , "substance" .)

I've seen this clue in The Guardian.

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