Second sin St Anthony embodies? (7)
I believe the answer is:
instant
'second' is the definition.
(I know that instant is a type of second)
'sin st anthony embodies?' is the wordplay.
'embodies?' indicates a hidden word.
'INSTANT' is hidden in the letters of 'sin st anthony'.
(Other definitions for instant that I've seen before include "Immediate; moment in time" , "The blink of an eye" , "Short time, of the current month" , "Without delay - short time" , "Immediate, twinkling" .)