A lot of bears see you fish (5,3)
I believe the answer is:
manta ray
'fish' is the definition.
(manta ray is a kind of fish)
'a lot of bears see you' is the wordplay.
'a lot of' becomes 'many' (many means a lot).
'bears' indicates putting letters inside.
'see you' becomes 'ta-ra' (both can mean goodbye).
'many' going around 'tara' is 'MANTA RAY'.
(Other definitions for manta ray that I've seen before include "large fish" , "Devilfish" .)