Delicate tin buckles in time (6)
I believe the answer is:
dainty
'delicate' is the definition.
(similar in meaning)
'tin buckles in time' is the wordplay.
'buckles' indicates an anagram.
'in' indicates putting letters inside.
'time' becomes 'day' (day is a kind of time).
'tin' with letters rearranged gives 'int'.
'int' going inside 'day' is 'DAINTY'.
(Other definitions for dainty that I've seen before include "Titbit, delicacy" , "Delicate and petite" , "Small and beautiful" , "Choice" , "Piece of cake!" .)