Formed lump made from cedar, etc. (8)

I believe the answer is:

accreted

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

'formed lump' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Maybe there's an association between them I don't understand?

'from cedar etc' is the wordplay.
'from' indicates anagramming the letters (from the letters).
'cedar'+'etc'='cedaretc'
'cedaretc' is an anagram of 'ACCRETED'.

'made' acts as a link.

Can you help me to learn more?

(Another definition for accreted that I've seen is " Accumulated".)

I've seen this clue in the Sydney Morning Herald.

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.