The witches' little cavern at the end of the garden (5)

I believe the answer is:
coven
'the witches'' is the definition.
(a coven is a group of witches)
'little cavern at the end of the garden' is the wordplay.
'little' says to take the initial letters.
'at the end' means one lot of letters go next to another.
'of' becomes 'o''.
'the garden' becomes 'ven' (I can't explain this - if you can you should give a lot more credence to this answer).
The first letter of 'cavern' is 'c'.
'c'+'o'+'ven'='COVEN'
Can you help me to learn more?
(Other definitions for coven that I've seen before include "Some wise women" , "Witches' assembly" , "collection of bewitching women" , "Witches' meeting" , "Charming women" .)
