Crossword Genius

Surprised, began to ring the number (8)

Ross

I believe the answer is:

startled

'surprised' is the definition.
('startled' can be similar in meaning to 'surprised')

'began to ring the number' is the wordplay.
'began' becomes 'started' ('start' can be a synonym of 'begin').
'to ring' is an insertion indicator.
'the number' becomes 'l' (L is an example**).
'started' placed around 'l' is 'STARTLED'.

(Other definitions for startled that I've seen before include "Frightened or surprised suddenly" , "Frightened or suprised suddenly" , "Caused sudden alarm" , "Affrighted" , "Taken aback" .)

I've seen this clue in the Evening Standard.
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.