Goes back on and examines without right (7)

'goes back' is the definition.
(I've seen this in another clue)

'on and examines without right' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'and' means one lot of letters go next to another.
'examines' becomes 'vets' (I've seen this in another clue).
'without' indicates putting letters inside ('without' can be similar in meaning to 'outside').
'right' becomes 'r' (common abbreviation).
'vets' placed around 'r' is 'verts'.
're'+'verts'='REVERTS'