Coffee -- a current one watering-hole picked up (7)
I believe the answer is:
arabica
'coffee' is the definition.
(type of coffee plant)
'a current one watering-hole picked up' is the wordplay.
'current' becomes 'ac' (alternating current).
'one' becomes 'i' (Roman numeral).
'watering hole' becomes 'bar' (watering hole can mean a drinking establishment).
'picked up' is a reversal indicator.
'ac'+'i'+'bar'='acibar'
'acibar' back-to-front is 'rabica'.
'a'+'rabica'='ARABICA'
(Other definitions for arabica that I've seen before include "Variety of coffee beans" , "Shrubby tree of tropical Africa cultivated for coffee" , "Type of coffee bean" , "sort of bean" , "Variety of coffee bean" .)