Shocked by a later deception (8)
I believe the answer is:
betrayal
'deception' is the definition.
(betraying can mean deceiving someone)
'shocked by a later' is the wordplay.
'shocked' is an anagram indicator (I've seen this in other clues).
'by'+'a'+'later'='byalater'
'byalater' anagrammed gives 'BETRAYAL'.
(Other definitions for betrayal that I've seen before include "Treacherous act" , "letting side down" , "Selling" , "Breach of trust" , "Breaking of trust" .)