Crossword Genius

Reappear concerning dog (5)

Ross

I believe the answer is:

recur

'reappear' is the definition.
(thesaurus)

'concerning dog' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'dog' becomes 'cur' (both can mean a despicable person).
're'+'cur'='RECUR'

(Other definitions for recur that I've seen before include "Happen repeatedly" , "Come round again" , "Be repeated" , "expected to return" , "Persist" .)

I've seen this clue in The Daily Express and The Mirror.
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