Located one in camouflaged NATO base (10)
I believe the answer is:
foundation
'base' is the definition.
(I know that base can be written as foundation)
'located one in camouflaged nato' is the wordplay.
I cannot quite see how this works, but
'located' could be 'found' (I've seen this in another clue) and 'found' is present in the answer.
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
an anagram of 'nato' is 'aton' which is within the left over letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for foundation that I've seen before include "Base" , "charity, say" , "Artificial jet of water" , "Construction on which to build" , "cosmetic aid?" .)