Give warning of time with hour consumed (8)
I believe the answer is:
threaten
'give warning' is the definition.
(thesaurus)
'time with hour consumed' is the wordplay.
'time' becomes 't' (abbreviation).
'with' is a charade indicator (letters next to each other).
'hour' becomes 'hr' (abbreviation).
'consumed' becomes 'eaten' (similar in meaning).
't'+'hr'+'eaten'='THREATEN'
'of' is the link.
(Other definitions for threaten that I've seen before include "Look likely to" , "Impend, portend" , "Put at risk, endanger" , "Put in jeopardy" , "Utter intentions of injury or punishment" .)