Earth to become fine with time (4)

I haven't cracked this one yet — but the brilliant team at Times for the Times have:

SET (fine – in good order; all set), T (time). Dangerous territory this as I think I was called out on it on a previous occasion, but as far as I’m aware the only animals that live in a SETT are badgers. According to Chambers their hole can also be called an ‘earth’, but ‘earth’ is more usually associated with foxes.