Al joins this worker for a drink (5)
I believe the answer is:
miner
'al joins this worker for a drink' is the definition.
'miner' can be an answer for 'worker' (miner is a kind of worker). I'm not certain of the rest of the definition.
This is all the clue.
Can you help me to learn more?
(Other definitions for miner that I've seen before include "Underground worker" , "Pit worker" , "Underground labourer" , "Collier" , "Excavator" .)