At wedding, one who assists our side and the bride? (5)
I believe the answer is:
usher
'at wedding one who assists' is the definition.
'our side and the bride?' is the wordplay.
'our side' becomes 'us' (I've seen this in other clues).
'and' means one lot of letters go next to another.
'the bride?' becomes 'her' (I can't justify this - if you can you should give a lot more credence to this answer).
'us'+'her'='USHER'
Can you help me to learn more?
(Other definitions for usher that I've seen before include "Doorkeeper in parliament or 29 down" , "Helper at wedding" , "One who shows people to seats" , "Cinema or wedding attendant" , "Introduce" .)