Racecourse isn't available when source of funding is lost (7)
I believe the answer is:
aintree
'racecourse' is the definition.
(horseracing venue in Liverpool)
'isn't available when source of funding is lost' is the wordplay.
I cannot really see how this works, but
'isn't' could be 'aint' (non-standard version of 'isn't') and 'aint' is present in the answer.
'when' could be 'e' (I've seen this in other clues) and 'e' is found in the answer.
The remaining letters 're' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
(Other definitions for aintree that I've seen before include "Liverpool race course" , "Trainee in Grand National venue" , "National racecourse" , "6 National course" , "Venue of the Grand National race" .)