Labourer wants beer with lemonade essentially (4)
I believe the answer is:
hand
'labourer' is the definition.
(hand is a kind of labourer)
'beer with lemonade essentially' is the wordplay.
'beer with lemonade' becomes 'shandy' (I've seen this before).
'essentially' indicates the central letters.
The centre of 'shandy' is 'HAND'.
'wants' is the link.
(Other definitions for hand that I've seen before include "Given cards" , "Aid?" , "Unit of equine measurement" , "Pass" , "that may be engaged in a shake" .)