Authentic old Spanish coin -- is it brought back with cents? (9)
I believe the answer is:
realistic
'authentic' is the definition.
(thesaurus)
'old spanish coin is it brought back with cents?' is the wordplay.
'old spanish coin' becomes 'real' (I've seen this in another clue).
'brought back' says the letters should be written backwards.
'with' is a charade indicator (letters next to each other).
'cents?' becomes 'c' (abbreviation for cents).
'it' written backwards gives 'ti'.
'real'+'is'+'ti'+'c'='REALISTIC'
(Other definitions for realistic that I've seen before include "believable" , "Level-headed" , "Practicable" , "Down-to-earth" , "Lifelike" .)