Claim a tureen allows what's inside to develop fully (6)
I believe the answer is:
mature
'develop fully' is the definition.
'mature' can be an answer for 'develop' (maturing is a kind of developing). I am unsure of the 'fully' bit.
'claim a tureen allows what's inside' is the wordplay.
'what's inside' says the answer is hidden in the clue.
'MATURE' can be found hidden inside 'claim a tureen allows'.
'to' is the link.
Can you help me to learn more?
(Other definitions for mature that I've seen before include "Fully developed physically" , "Age" , "Grown-up" , "of older years" , "Fully grown and adult" .)