A course on holiday (4)

I believe the answer is:

away

'on holiday' is the definition.
(away from one's home)

'a course' is the wordplay.
'course' becomes 'way' (way is a kind of course).
'a'+'way'='AWAY'

(Other definitions for away that I've seen before include "Non-home match" , "Missing" , "playing at United?" , "Game played at opponents' ground" , "At a distance; match" .)

I've seen this clue in The Guardian.

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