Steer and large bull (6)
I believe the answer is:
drivel
'bull' is the definition.
(thesaurus)
'steer and large' is the wordplay.
'steer' becomes 'drive' (I've seen this before).
'and' means one lot of letters go next to another.
'large' becomes 'l'.
'drive'+'l'='DRIVEL'
(Other definitions for drivel that I've seen before include "Nonsensical talk" , "Spoken nonsense" , "Silly talk, twaddle" , "Worthless talk" , "Balls" .)