Actor taken in by hidden ironic content (2,4)
I believe the answer is:
de niro
'actor' is the definition.
(I know that De Niro is a actor)
'taken in by hidden ironic content' is the wordplay.
'taken in by' indicates the answer is hidden within the clue.
'DE NIRO' is hidden within 'hidden ironic content'.
(Other definitions for de niro that I've seen before include "Actor who plays mainly tough characters" , "Robert . . . . . ., film star of ''Taxi Driver'' and ''Raging Bull''" , "Robert . . . . . ., male movie star of 'Taxi Driver' and 'Raging Bull'" , "Robert ... (''you talkin' to me?'')" , "Robert -, Oscar-winning US actor" .)