Do what's necessary in Leatherhead (3)

I believe the answer is:

eat

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'do what's necessary' is the definition.
I can't tell whether this defines the answer.

'in leatherhead' is the wordplay.
'in' says the answer is hidden in the clue.
'EAT' can be found hidden inside 'leatherhead'.

Can you help me to learn more?

(Other definitions for eat that I've seen before include "Consume (food)" , "Dine in a restaurant" , "Partake of" , "put away" , "Use a knife and fork" .)

I've seen this clue in the Evening Standard.

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