Lower down there, perhaps, at the end of the garden (6)
I believe the answer is:
nether
'lower down' is the definition.
'nether' can be an answer for 'down' (thesaurus). I am unsure of the 'lower' bit.
'there perhaps at the end of the garden' is the wordplay.
'perhaps' indicates an anagram.
'at' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the end of the' says to take the final letters.
The final letter of 'garden' is 'n'.
'there' is an anagram of 'ether'.
'ether' put after 'n' is 'NETHER'.
Can you help me to learn more?
(Other definitions for nether that I've seen before include "Lower; Dutch '-lands'" , "These garments are for the bottom half" , "North European country" , "Underground" , "These regions are hell, the underworld" .)