Blow full of trouble for sheriff's officer (7)
I believe the answer is:
bailiff
'sheriff's officer' is the definition.
(I've seen this before)
'blow full of trouble' is the wordplay.
'blow' becomes 'biff' (biff is a kind of blow**).
'full of' indicates putting letters inside.
'trouble' becomes 'ail' ('ail' can be a synonym of 'trouble').
'biff' placed around 'ail' is 'BAILIFF'.
'for' acts as a link.
(Other definitions for bailiff that I've seen before include "Sheriff's officer - landlord's agent" , "Officer of court" , "Court official" , "Landowner's agent" , "Law officer who helps sheriff, say to foreclose" .)