For the journey back, the same case (6)
I believe the answer is:
tripod
'for' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?
'the journey back the same case' is the wordplay.
'the journey' becomes 'trip' (trip is a kind of journey).
'back' shows that the letters should be reversed in order.
'the same' becomes 'ditto' (I've seen this before).
'case' says to hollow out the word (remove centre letters).
'ditto' with its centre removed is 'do'.
'do' written backwards gives 'od'.
'trip'+'od'='TRIPOD'
Can you help me to learn more?
(Other definitions for tripod that I've seen before include "Pay heed" , "support called for" , "Stand on three legs" , "Stand for camera etc" , "Three-legged stand as for camera" .)