Tirades freshly mounted (7)
I believe the answer is:
astride
'mounted' is the definition.
(I've seen this in another clue)
'tirades freshly' is the wordplay.
'freshly' indicates anagramming the letters.
'tirades' anagrammed gives 'ASTRIDE'.
(Other definitions for astride that I've seen before include "Straddling (horse)" , "On the back of" , "on horseback" , "Extending across" , "With feet apart" .)