Rambling hesitation and bluster (6)
I believe the answer is:
errant
'rambling' is the definition.
(I've seen this in another clue)
'hesitation and bluster' is the wordplay.
'hesitation' becomes 'er' (sound made while hesitating - um, er).
'and' says to put letters next to each other.
'bluster' becomes 'rant' (I've seen this in another clue).
'er'+'rant'='ERRANT'
(Other definitions for errant that I've seen before include "heretical?" , "Behaving badly" , "Quixotic" , "Roving" , "like Don Quixote?" .)