Follow mother's teaching (5)
I believe the answer is:
dogma
'teaching' is the definition.
(dogma is a kind of teaching)
'follow mother's' is the wordplay.
'follow' becomes 'dog' (I've seen this before).
'mother' becomes 'ma' (ma is a kind of mother).
'dog'+'ma'='DOGMA'
(Other definitions for dogma that I've seen before include "Doctrine accepted as true without proof" , "Article of faith" , "Inflexible principles" , "Code of beliefs accepted as authoritative" , "fixed opinion" .)