Beginning becoming very good (7,8)

I believe the answer is:

getting cracking

I'm a little stuck... Click here to teach me more about this clue!

'beginning' is the definition.
(getting cracking is a kind of begining)

'becoming very good' is the wordplay.
'becoming' becomes 'getting' ('get' can be a synonym of 'become').
'very good' becomes 'cracking' (similar in meaning. I am not sure about the 'very' bit.).
'getting'+'cracking'='GETTING CRACKING'

Can you help me to learn more?

I've seen this clue in The Daily Express.

Want a hint initially instead of a full solution? Install my app