Pen making follower collapse (9)
I believe the answer is:
sheepfold
'pen' is the definition.
(enclosure for sheep)
'follower collapse' is the wordplay.
'follower' becomes 'sheep' (I can't explain this - if you can you should believe this answer much more).
'collapse' becomes 'fold' (as in a business folding).
'sheep'+'fold'='SHEEPFOLD'
'making' is the link.
Can you help me to learn more?
(Other definitions for sheepfold that I've seen before include "Pen for lambs, ewes, etc" , "Farm pen" .)