Farmworker has drink, tucking into a bit (9)
I believe the answer is:
swineherd
'tucking into a bit' is the definition.
I can't judge whether this definition defines the answer.
'farmworker has drink' is the wordplay.
'farmworker' becomes 'sherd' (I can't justify this - if you can you should believe this answer much more).
'has' indicates putting letters inside.
'drink' becomes 'wine' (wine is an alcoholic drink).
'sherd' going around 'wine' is 'SWINEHERD'.
Can you help me to learn more?
(Other definitions for swineherd that I've seen before include "I work on farm" , "Tamworth's keeper" , "Farmhand" , "Tender of pigs" , "Pig tender" .)