Crossword Genius

Have presidential occupation? (6)

Ross

I believe the answer is:

reside

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

'have' is the definition.
The definition and answer can be both to do with fundamental existence as well as being verbs in their base form.
Maybe they are linked in a way I don't understand?

'presidential occupation?' is the wordplay.
'RESIDE' is hidden within the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for reside that I've seen before include "Dwell permanently" , "Make one's home permanently" , "Lodge" , "Stay - desire (anag)" , "Live (at an address)" .)

I've seen this clue in the Evening Standard.
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