Militarily, pull a fast one for Trump? (8)
I believe the answer is:
outflank
'trump?' is the definition.
('outflank' can be a synonym of 'trump')
'militarily pull a fast one' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
This may be the basis of clue (or it may be nonsense).
'for' is the link.
Can you help me to learn more?
(Other definitions for outflank that I've seen before include "Get the better of, especially by surprise action" , "Move round (enemy's) side" , "Move around (an enemy's forces)" , "defeat" , "Pass around the side of" .)