Crossword Genius

Started block, say, inside (5)

Ross

I believe the answer is:

began

'started' is the definition.
('begin' can be a synonym of 'start')

'block say inside' is the wordplay.
'block' becomes 'ban'.
'say' becomes 'eg' ().
'inside' indicates putting letters inside.
'ban' going around 'eg' is 'BEGAN'.

(Another definition for began that I've seen is " Commenced, started".)

I've seen this clue in The Mirror.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.