Crossword Genius

Fed up with border guard (6)

Ross

I believe the answer is:

defend

'guard' is the definition.
(defend can mean to guard or protect)

'fed up with border' is the wordplay.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'with' says to put letters next to each other.
'border' becomes 'end' (I've seen this in other clues).
'fed' backwards is 'def'.
'def'+'end'='DEFEND'

(Other definitions for defend that I've seen before include "Fortify" , "Champion" , "Resist an attack" , "Block, as in cricket" , "Help or protect against attack" .)

I've seen this clue in The Times.
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