Crossword Genius

Beginner starts to think it's really obvious (4)

Ross

I believe the answer is:

tiro

'beginner' is the definition.
('tiro' can be a synonym of 'beginner')

'starts to think it's really obvious' is the wordplay.
'starts to' indicates taking the first letters.
The initial letters of 'think its really obvious' is 'TIRO'.

(Another definition for tiro that I've seen is " Novice".)

I've seen this clue in The Telegraph.
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