Unwilling to work, reclined drinking last of fizz (4)
I believe the answer is:
lazy
'unwilling to work' is the definition.
(I've seen this before)
'reclined drinking last of fizz' is the wordplay.
'reclined' becomes 'lay' (I've seen this in another clue).
'drinking' means one lot of letters goes inside another (inserted letters are consumed or drunk).
'last of' indicates one should take the final letters.
The final letter of 'fizz' is 'z'.
'lay' going around 'z' is 'LAZY'.
(Other definitions for lazy that I've seen before include "Slothful" , "Shiftless" , "Idle - indolent" , "avoiding work" , "Unwilling to work" .)