Plan concealed by bride always (4)
I believe the answer is:
idea
'plan' is the definition.
(thesaurus)
'concealed by bride always' is the wordplay.
'concealed' indicates the answer is hidden within the clue.
'IDEA' is hidden within 'by bride always'.
(Other definitions for idea that I've seen before include "Brainwave" , "Intention" , "Notion, image" , "Light bulb above head" , "Fancy" .)