Section of steel finial small and delicate (5)
I believe the answer is:
elfin
'small and delicate' is the definition.
(elfin means small or cute)
'section of steel finial' is the wordplay.
'section of' indicates the answer is hidden within the clue.
'ELFIN' can be found hidden inside 'steel finial'.
(Other definitions for elfin that I've seen before include "Resembling one of the little people" , "Delicately framed" , "Mischievous sprite" , "puckish" , "Small, delicate and charming" .)