Lucky charm found in mother's bed (6)
I believe the answer is:
mascot
'lucky charm' is the definition.
(something bringing good luck)
'mother's bed' is the wordplay.
'mother's' becomes 'ma's' (Ma is another word for mother or mum).
'bed' becomes 'cot' (cot is a type of bed).
'mas'+'cot'='MASCOT'
'found in' acts as a link.
(Other definitions for mascot that I've seen before include "Good luck token" , "that's charming?" , "Thing supposed to bring good luck" , "Bringer of good luck to team, etc" , "Team's good-luck bringer" .)