Bottle belonging to us is found in enclosure (7)
I believe the answer is:
courage
'bottle' is the definition.
(I've seen this before)
'belonging to us is found in enclosure' is the wordplay.
'belonging to us' becomes 'our' (us, you and me).
'is found in' means one lot of letters goes inside another.
'enclosure' becomes 'cage' (cage is a kind of enclosure).
'our' going inside 'cage' is 'COURAGE'.
(Other definitions for courage that I've seen before include "Bottle" , "Valour" , "Grit" , "Bravery, fortitude" , "Ability to conquer fear or despair" .)