Watch close to Inuit agitated polar bears (6)
I believe the answer is:
patrol
'watch' is the definition.
(I know that patrol is a type of guard)
'close to inuit agitated polar bears' is the wordplay.
'close to' suggests the final letters (the 'close' to the word).
'agitated' indicates anagramming the letters.
'bears' is an insertion indicator.
The final letter of 'inuit' is 't'.
'polar' with letters rearranged gives 'parol'.
't' placed inside 'parol' is 'PATROL'.
(Other definitions for patrol that I've seen before include "Detachment for security or reconnaissance" , "Small group of Guides/Scouts" , "Move around an area to watch or protect" , "Move round and keep watch" , "Make a regular tour to maintain security" .)