Figure quaintly dined in principle (5)
I believe the answer is:
tenet
'principle' is the definition.
(a tenet is a principle or value)
'figure quaintly dined' is the wordplay.
I cannot quite see how this works, but
'figure' could be 'ten' (ten is a number or figure) and 'ten' is found within the answer.
This explanation may well be incorrect...
'in' is the link.
Can you help me to learn more?
(Other definitions for tenet that I've seen before include "Conviction" , "Belief or doctrine - a palindrome" , "Canon" , "you may believe in it" , "Item of belief" .)