A pair of Spaniards in German administration (6)
I believe the answer is:
dosing
'administration' is the definition.
(thesaurus)
'a pair of spaniards in german' is the wordplay.
'a pair of spaniards' becomes 'dos' (I am not sure about this - if you are sure you should believe this answer much more).
'german' becomes 'g' (abbreviation).
'dos'+'in'+'g'='DOSING'
Can you help me to learn more?
(Other definitions for dosing that I've seen before include "Giving medicine" , "Dispensing" .)