Brings up the foreign course at school without fail (6)
I believe the answer is:
always
'without fail' is the definition.
(I've seen this in another clue)
'brings up the foreign course at school' is the wordplay.
'brings up' says the letters should be written in reverse (I've seen 'bring up' mean this).
'the foreign' becomes 'la'.
'course' becomes 'way' (way is a kind of course).
'at' means one lot of letters go next to another.
'school' becomes 'S'.
'la' backwards is 'al'.
'al'+'way'+'s'='ALWAYS'
(Other definitions for always that I've seen before include "For good" , "Continually" , "On all occasions" , "Whatever happens!" , "For ever" .)