Hi Rocky,
27a - Chambers gives the definition of the answer as "to perch, settle" and "to land" so "settled is fine, I'd say.
23a - It's the type of "permit" one might need for foreign travel then, if you spit the answer 4, 4 you get what "posh diners do after meal"
22d - the "order student" should be looked at from a religious sense then read as 2, 4 for the "what she claims to possess"
Hope that helps:-)
PS I remember I had a self-assemble IKEA wardrobe once but I lifted it up before putting the back on - what an almighty noise it made when it it immediately came crashing down:-)