Agitated Poles eating fish (6)
I believe the answer is:
shaken
'agitated' is the definition.
('shake' can be a synonym of 'agitate')
'poles eating fish' is the wordplay.
'poles' becomes 'sn' (North and South poles).
'eating' indicates putting letters inside.
'fish' becomes 'hake' (hake is a kind of fish).
'sn' going around 'hake' is 'SHAKEN'.
(Other definitions for shaken that I've seen before include "Agitated or disturbed" , "Having been shocked or disturbed" , "Jolted and shocked - like James Bond's martini?" , "Shocked, unnerved" , "Astonished; vibrated" .)