Answer:

fish

Answer	Crossword Clue
FISH	Food with chips
FISH	Porgy and bass
FISH	Angle for

FISH	Bass, but not guitar or drums
FISH	Guppy or grouper
FISH	Angle
FISH	Barney Miller spinoff
FISH	Look for a compliment
FISH	Trawler's haul
FISH	Protein source
FISH	Seek indirectly

FISH	Burbot or turbot
FISH	Net gains?
FISH	Christian's car emblem
FISH	Do some casting
FISH	Drop a line?
FISH	Each capitalized clue's answer has one
FISH	Bass and others
FISH	Sneakily probe (for)

FISH	Word to add to each theme answer that will make sense of its clue
FISH	Dangle a line from a dock, say
FISH	Bass or drum
FISH	Drop hints, say
FISH	Chips partner
FISH	School group?
FISH	Tarpon or tuna
FISH	Salmon or sardine

FISH	Throw out a line, perhaps
FISH	"Cut bait" alternative
FISH	Look for, as compliments
FISH	Play bass?
FISH	Pursue Izaak Walton's pastime
FISH	Sole mates?
FISH	Look (for), as compliments
FISH	Haul from a trawl

FISH	Grunt and carp
FISH	Pike or perch
FISH	Char and smelt, e.g.
FISH	Eels, e.g.
FISH	School group