Ambassador's worried about technology delay (8)
I believe the answer is:
hesitate
'delay' is the definition.
(hesitating is a kind of delaying)
'ambassador's worried about technology' is the wordplay.
'ambassador's' becomes 'hes' (His or Her Excellency).
'worried' becomes 'ate' (something worrying may eat someone up).
'about' is a charade indicator (letters next to each other).
'technology' becomes 'it'.
'ate' after 'it' is 'itate'.
'hes'+'itate'='HESITATE'
(Other definitions for hesitate that I've seen before include "He who does it may be lost" , "Falter, delay" , "Falter, waver" , "Be reluctant" , "Pause, think twice" .)