Fluff caught in back of the hoover, first of all (5)
I believe the answer is:
botch
'fluff' is the definition.
('botch' can be a synonym of 'fluff')
'caught in back of the hoover first of all' is the wordplay.
'caught' becomes 'c' (cricket abbreviation**).
'in' means one lot of letters goes inside another.
'first of all' says to take the initial letters.
The first letters of 'back of the hoover' is 'both'.
'c' inserted within 'both' is 'BOTCH'.
(Other definitions for botch that I've seen before include "Mess up (a task)" , "Spoil by clumsy work, make a hames of" , "bad job" , "Repair badly" , "Mend clumsily" .)