Why bride, unclothed, is cross (6)

I believe the answer is:

hybrid

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

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

'why bride unclothed' is the wordplay.
'HYBRID' is hidden within the letters.
However, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for hybrid that I've seen before include "Cross breed" , "Crossbred" , "Plant that is the offspring of two different species" , "Mix of species" , "Crossbreed or mixture" .)

I've seen this clue in The Sunday Times and The Times.

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