Follow mother's belief (5)
I believe the answer is:
dogma
'belief' is the definition.
(synonyms)
'follow mother's' is the wordplay.
'follow' becomes 'dog' (I've seen this before).
'mother' becomes 'ma' (ma can mean mother).
'dog'+'ma'='DOGMA'
(Other definitions for dogma that I've seen before include "Tenet" , "Authoritative doctrine" , "Item of belief" , "Inflexible principles" , "Belief, precept" .)