Possible Clues:

• Wedding party member
• Wedding attendant
• Female supporter at the match
• Dim seabird flying around wedding participant
• Runner-up always travels with mum in command
• Going to the match, one may be at the back of the train
• Book journeys, obliged to announce one's holding up train perhaps
• Union supporter trips in British Museum - help needed
• One may hold up the train
• Bachelor travels with male help for female attendant