Small boats welcome in new design (8)
I believe the answer is:
dinghies
'small boats' is the definition.
(dinghy is a kind of small boat)
'welcome in new design' is the wordplay.
'welcome' becomes 'hi' (both are greetings).
'in' means one lot of letters goes inside another.
'new' is an anagram indicator.
'design' is an anagram of 'dinges'.
'hi' put into 'dinges' is 'DINGHIES'.
(Other definitions for dinghies that I've seen before include "Small open boats" , "Small rowing boats" , "On the surface, they go along" .)