Obtain inner satisfaction (3)

I believe the answer is:

eat

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'obtain' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps you can see an association between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for eat that I've seen before include "Make food disappear" , "Take food" , "tolerate in diet" , "Have 23d [MEAL]" , "Corrode" .)

I've seen this clue in the Evening Standard.

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