Irishman turned on sentry duty (9)
I believe the answer is:
patrolled
'irishman turned on sentry duty' is the definition.
I can't tell whether this definition defines the answer.
'irishman turned on' is the wordplay.
'irishman' becomes 'pat'.
'turned' becomes 'rolled' (rolling is a kind of turning).
'on' is a charade indicator (letters next to each other).
'pat'+'rolled'='PATROLLED'
Can you help me to learn more?
(Other definitions for patrolled that I've seen before include "Monitored" , "did the rounds" .)