A drink the pit worker has a name for (7)
I believe the answer is:
mineral
'a drink' is the definition.
(I've seen this before)
'the pit worker has a name for' is the wordplay.
'the pit worker' becomes 'miner' (I've seen this before).
'has' says to put letters next to each other.
'a name for' becomes 'al' (I am not sure about this - if you are sure you should believe this answer much more).
'miner'+'al'='MINERAL'
Can you help me to learn more?
(Other definitions for mineral that I've seen before include "Made from inorganic matter" , "Zinc or magnesium, say" , "Valuable ore" , "Type of spring water" , "Substance needed for health; ore" .)