Contract Has "7 Day Trial" Clause - Should I be worried?

[PerfectStorm]

In reality all contracts are instant dismissal (Sorry we have no more work for you). So I don't know what your concern is..

True, but if this place is also the sort of client that has a 3-stage interview process, no/conditional WFH, dirty looks if you want to leave before 9PM... then it may hint towards something that may not be that much fun to get into.

[SussexSeagull]

Heavily reduced/no notice in the initial period is not uncommon. Just make sure you are getting paid for this 'trial' period.