Shy bride holding cross (6)
I believe the answer is:
hybrid
'cross' is the definition.
(thesaurus)
'shy bride holding' is the wordplay.
'holding' says the answer is hidden in the clue.
'HYBRID' is hidden within 'shy bride'.
(Other definitions for hybrid that I've seen before include "Crossbreed or mixture" , "Like a mule" , "A composite of mixed origin" , "Crossed offspring" , "Cross breed" .)