Thanks for having a go everyone, my brief explanations as follows...
Boatman...groan! Awful, ought to be reported!(8) argonaut
anag(awful) of groan + aut(sounds like ought)
Bonxie...not brilliant and on reflection, for the birds(4) auks
bonxie=great skua, drop the great(brilliant) and reverse
Tramp...that English eccentric(taking the pith perhaps), best keep him here(2,4,6) at arm's length
Complex anag...trampthatenglish-pith
Shed...a graduate(first)in science, easy!(7) abscise
a-BSC-ise(first, in science easy)
Enigmatist...at times in good form?(7) anagram
enigmatist is an anagram “of at times in g”
Paul...occasionally mean and crafty, but within the rules(9) allowable
paul occasionally..AL-low-able
A celebrated artist still working for all to enjoy, often transporting us...flipping marvellous!(9) araucaria
A/celebrated artist(Royal Acedemicians must be still working professionally)=RA/forall to enjoy=U(niversal)/often transporting us=CAR/marvellous(first class)=A1, flipped(reversed)=IA