Administrator on holiday with one left supporting spies (8)
I believe the answer is:
official
'administrator' is the definition.
(I know that administrator can be written as official)
'on holiday with one left supporting spies' is the wordplay.
'on holiday' becomes 'off' (I've seen this in other clues).
'with one' becomes 'i' (Roman numeral. I am not sure about the 'with' bit.).
'left' becomes 'l' (common abbreviation).
'supporting' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'spies' becomes 'CIA' (Central Intelligence Agency).
'l' after 'cia' is 'cial'.
'off'+'i'+'cial'='OFFICIAL'
Can you help me to learn more?
(Other definitions for official that I've seen before include "Public employee" , "executive" , "Approved by authority" , "Relating to authority" , "It's no rumour - he's in charge" .)