Grocers intrinsically backing sustainability label (3)

I believe the answer is:

eco

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'sustainability label' is the definition.
I know nothing about this answer so I can't judge whether this works.

'grocers intrinsically backing' is the wordplay.
'intrinsically' says the answer is hidden in the clue.
'backing' is a reversal indicator.
'oce' is hidden within 'grocers'.
'oce' in reverse letter order is 'ECO'.

Can you help me to learn more?

(Other definitions for eco that I've seen before include "Umberto - - , novelist" , "Environmental group" , "Umberto --, Italian writer" , "Umberto -, Italian author (The Name of the Rose)" , "Concerned with the environment" .)

I've seen this clue in The Independent.

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