Egg and cucumber in this Kentish Town? (8)

I believe the answer is:

sandwich

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'town?' is the definition.
(I have seen 'seaside town' mean 'sandwich' so perhaps 'town' could also mean 'sandwich')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sandwich that I've seen before include "See 14" , "See 16" , "The snack might result in bad chin wads" , "Food between slices" , "Snack; sponge cake" .)

I've seen this clue in The Sun.

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