Expanding area of science lab or a tin greenhouse (11)
I believe the answer is:
elaborating
'expanding' is the definition.
The answer and definition can be both related to change as well as being present participle verbs.
Maybe there's an association between them I don't understand?
'area of science lab or a tin greenhouse' is the wordplay.
'area of' indicates the answer is hidden within the clue (I've seen this in other clues).
'ELABORATING' can be found hidden inside 'science lab or a tin greenhouse'.
Can you help me to learn more?
(Other definitions for elaborating that I've seen before include "going into detail" , "Adding detail and complication to" .)