Getting bigger by the addition of folds? (10)
I believe the answer is:
increasing
'getting' is the definition.
The answer and definition can be both related to change as well as being present participle verbs.
Maybe you can see a link between them that I don't see?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for increasing that I've seen before include "Making greater" , "on a larger scale?" , "Growing" .)