In art, children phrase it the wrong way (5)
I believe the answer is:
putti
'in art children' is the definition.
(term for angelic children in Renaissance art)
'phrase it the wrong way' is the wordplay.
'phrase' becomes 'put' (as in putting or phrasing an idea a certain way).
'the wrong way' is a reversal indicator.
'it' written backwards gives 'ti'.
'put'+'ti'='PUTTI'
(Other definitions for putti that I've seen before include "Renaissance sculptures, perhaps" , "Italian cherubs" , "Plump youth with kit off?" , "Infants pictured" , "Cupids" .)