Warn (5)
'warn' is the definition.
(cautioning is a kind of warning)
This is all the clue.
(Other definitions for caution that I've seen before include "Care taken to avoid danger" , "Attention to possible danger" , "amusing type" , "Prudent wariness" , "Vigilance" .)
'warn' is the definition.
(alarming is a kind of warning)
This is the entire clue.
(Other definitions for alarm that I've seen before include "A rousing sound in the morning" , "Safety bell or alert signal" , "Clock that wakes the sleeper" , "Frighten or startle" , "Warning sound/device" .)
'warn' is the definition.
(I know that alert is a kind of the warn)
This is the entire clue.
(Other definitions for alert that I've seen before include "Watchful and observant" , "'Attentive, watchful (5)'" , "sharp-witted" , "Prompt" , "Danger warning" .)
'warn' is the definition.
(I know that admonish is a kind of the warn)
This is the entire clue.
(Other definitions for admonish that I've seen before include "Chide or reprimand" , "Scold, wag the finger at" , "Chide, reprove" , "criticise" , "censure" .)