Crossword Genius

Be a good Dalek (4)

Ross

I believe the answer is:

obey

I'm a little stuck... Click here to teach me more about this clue!

'be' is the definition.
The definition and answer can be both to do with social activities as well as being verbs in their base form.
Maybe you can see a link between them that I can't see?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for obey that I've seen before include "Do what one is told" , "Carry out (a command)" , "Do as one's told" , "Abide by" , "Heed" .)

I've seen this clue in the Evening Standard.
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