### Clue: Irish label in Ireland largely promoted water (8)
### Answer: IRRIGATE 
 ### Explanation: Definition: water
  IR(abbrev. for "Irish") + **reversal of**(promoted, in a down clue) [TAG(a label) **contained in**(in) EIR{"Eire"(the Irish name for Ireland) **minus** its last letter(largely)}]. 
Answer: As a verb, to water.