Crossword Genius

In camp, no politician was a ruler! (4)

Ross

I believe the answer is:

inca

'a ruler' is the definition.
(I know that Inca is a type of queen)

'in camp no politician' is the wordplay.
'no' suggests deleting specific letters.
'politician' becomes 'pm' (short for prime minister).
'camp' with 'pm' taken out is 'ca'.
'in'+'ca'='INCA'

'was' acts as a link.

(Other definitions for inca that I've seen before include "Member of old Peruvian Indian race" , "Ancient Peruvian like Cain" , "Language" , "Old Peruvian descended from Cain" , "Member of Andean people conquered by Spain" .)

I've seen this clue in the Evening Standard.
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