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 can mean mother).
'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" .)