Mother with poor stature becomes fully developed (9)

'becomes fully developed' is the definition.
I can't tell whether this definition defines the answer.

'mother with poor stature' is the wordplay.
'mother' becomes 'ma' (ma can mean mother).
'with' says to put letters next to each other.
'poor' is an anagram indicator.
'stature' with letters rearranged gives 'turates'.
'ma'+'turates'='MATURATES'

Can you help me to learn more?