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Hm. Don't see how "cut off" works...

Oh, sorry, forgot the final anagram: DETONATE (not DENOTATE obsolete or antedote given in CS machine: error?!)

I agree with GK's answers however
1. Anagram of turn + c (initially confident) + he + on = appearing
2 Cut off by river I took as being surrounded by river.
4. OTT reversed

OTT, Over The Top

Oh, of course: didn't remember that abb.!

1) Unusual turn by initially confident male appearing in club (9)
TRUNCHEON Anagram of Turn+c he on

2) Relaxation in shelter cut off by river (7)

DETENTE Tent inside river Dee (cut of by) was the intended indicator. http://www.thefreedictionary.com/d%C3%A9tente

3) Philosopher to get up having drunk dram before the start of lunch (9)

ARISTOTLE Dram =Tot with L from lunch inside Arise

4) Painter can rent rejecting what's wholly excessive (10)
TINTORETTO Can=Tin Rent=Tore OTT< wholly excessive (over the top)

The final anagram is indeed DETONATE

Thank you all very much for taking part, Seasons cheer to one and all HAPPY HOLIDAYS Cheers!

Thanks and Merry Christmas, imagcq
I had LEISURE for #2 - LEE (shelter, cut off to give LE), URE for the river, IS were the two letters I couldn't explain.
The others as the others have explained!

I also had LEISURE. There is an River Isur in Papua new Guinea. I thought everybody knew that !!!!
Sorry I did not have more time today.

Have a Happy Christmas Imagcq and thank you for some great clues.

Thanx again, imagcq, for providing us with additional exercises: it was a great idea of yours! And I wish you all an extremely MERRY Christmas
of course!