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Why is 'Splash in Sun possibly alienates some? Not half!' SENSATIONALISM? Or is it not?!
Also 'In Central America, caught one tuna? More than one.' - can only come up with CACHI, a mountain range I think.

SENSATIONALISE (ise rather than ism)

Slash implies an anagram of,
in + S (for sun)

possibly implies an anagram of,
alienates + so(half of the word some).

the whole clue means to Sentationalise

pardon my spelling.

SENSATIONALISE

angagram of - in + s + alienates + so.

CACTI
Central America = CA
caught = CT
one = I

Tuna is a type of cactus, plural being cacti!