Go back from park and garden, briefly (6)
I believe the answer is:
recede
'go back' is the definition.
(I've seen this before)
'park and garden briefly' is the wordplay.
'park' becomes 'rec' (I've seen this in other clues).
'and' says to put letters next to each other.
'garden' becomes 'eden' (I've seen this before).
'briefly' means to remove the last letter.
'eden' with its final letter taken off is 'ede'.
'rec'+'ede'='RECEDE'
'from' is the link.
(Other definitions for recede that I've seen before include "Go back, ebb" , "Decree (anag) - ebb" , "Move backward" , "Start balding" , "Decline" .)