Blackberry makes bishop wander (7)
I believe the answer is:
bramble
'blackberry' is the definition.
(I've seen this before)
'bishop wander' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'wander' becomes 'ramble' (synonyms).
'b'+'ramble'='BRAMBLE'
'makes' is the link.
(Other definitions for bramble that I've seen before include "Blackberry plant" , "Gather fruit" , "Blackberry shrub" , "berries" , "Wild thorny shrub" .)