Female unit on a camouflaged jet (8)
I believe the answer is:
fountain
'jet' is the definition.
(I know that jet can be written as fountain)
'female unit on a camouflaged' is the wordplay.
'female' becomes 'f' (common abbreviation).
'camouflaged' indicates an anagram (I've seen this in other clues).
'unit'+'on'+'a'='unitona'
'unitona' is an anagram of 'ountain'.
'f'+'ountain'='FOUNTAIN'
(Other definitions for fountain that I've seen before include "Fan out in ornamental water jet" , "Artificially-produced jet of water" , "Give out" , "Man-made water-jet" , "Artificial jet of water" .)