Up is where bats may be found in the end (9)
I believe the answer is:
increased
'found in the end' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Perhaps they are linked in a way I don't understand?
'up is where bats may' is the wordplay.
'up' becomes 'increase' (I've seen this before).
'is where bats may' becomes 'd' (I can't explain this - if you can you should give a lot more credence to this answer).
'increase'+'d'='INCREASED'
'be' is the link.
Can you help me to learn more?
(Other definitions for increased that I've seen before include "Made greater" , "Grew greater" , "Made bigger or more" , "Went up" , "Augmented" .)