Fish in this spot caught? (3)
I believe the answer is:
sea
'fish' is the definition.
(sea fish is a kind of fish)
'this spot caught?' is the wordplay.
'this spot' becomes 'see' (both can mean to notice or observe).
'caught?' shows a homophone (sound like) (to catch something can mean to hear it).
'see' is a homophone of 'SEA'.
'in' acts as a link.
(Other definitions for sea that I've seen before include "The tide" , "North for one" , "E.g. Yellow, Red area" , "It's stocked with fish" , "Cod's home?" .)