Crossword Genius

Vampire in corner -- cross raised (8)

Ross

I believe the answer is:

trapdoor

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

'vampire' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'corner cross raised' is the wordplay.
'corner' becomes 'trap' (I've seen this before).
'cross' becomes 'rood' (term for a crucifix).
'raised' is a reversal indicator.
'rood' backwards is 'door'.
'trap'+'door'='TRAPDOOR'

'in' is the link.

Can you help me to learn more?

(Other definitions for trapdoor that I've seen before include "Hinged flap" , "Hinged floor opening" , "Its movement can cause sudden drop" , "entrance into loft?" , "Means of access set in floor or ceiling" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app