Bride always keeps so perfect (5)
I believe the answer is:
ideal
'perfect' is the definition.
('ideal' can be similar in meaning to 'perfect')
'bride always keeps' is the wordplay.
'keeps' says the answer is hidden in the clue.
'IDEAL' is hidden in the letters of 'bride always'.
'so' is the link.
(Other definitions for ideal that I've seen before include "Model of excellence (5)." , "just the job" , "existing only in imagination" , "Perfect; a standard of perfection" , "Just right" .)