Crossword Genius

Course isn’t commonly free, not the first (7)

Ross

I believe the answer is:

aintree

'course' is the definition.
(I've seen this before)

'isn't commonly free not the first' is the wordplay.
'isn't commonly' becomes 'ain't' (non-standard version of 'isn't').
'not the first' means to remove the first letter.
'free' with its first letter taken away is 'ree'.
'aint'+'ree'='AINTREE'

(Other definitions for aintree that I've seen before include "place for horse racing" , "Home of the Grand National" , "Here they run" , "Venue of the Grand National race" , "Merseyside racecourse" .)

I've seen this clue in The Times.
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