Watchful living at resort (8)
I believe the answer is:
vigilant
'watchful' is the definition.
('vigilant' can be a synonym of 'watchful')
'living at resort' is the wordplay.
'resort' is an anagram indicator.
'living'+'at'='livingat'
'livingat' is an anagram of 'VIGILANT'.
(Other definitions for vigilant that I've seen before include "Keeping careful watch" , "On the lookout" , "Ever watchful" , "Watchful, alert to possible danger" , "Carefully observant or attentive" .)