Somehow writing ABC is simple (5)

I believe the answer is:

basic

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'simple' is the definition.
(similar in meaning)

'somehow writing abc is' is the wordplay.
'abc is' anagrams to 'BASIC'.
But, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for basic that I've seen before include "Popular programming language" , "'Primary, fundamental (5)'" , "Unembellished" , "Fundamental; alkaline" , "Cardinal" .)

I've seen this clue in The Irish Independent.

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