Inner demons surrounding geek (4)

I believe the answer is:

nerd

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

'geek' is the definition.
(I've seen this in another clue)

'inner demons surrounding' is the wordplay.
'NERD' is hidden within the letters.
However, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for nerd that I've seen before include "Obsessive," , "In slang, a foolish or uninteresting person" , "Technical expert" , "Someone boring (about computers?)" , "Anorak (informal)" .)

I've seen this clue in The Daily Express.

Want a hint initially instead of a full solution? Install my app