Act shy moving around boats (6)
I believe the answer is:
yachts
'boats' is the definition.
(yachting is a kind of boating)
'act shy moving' is the wordplay.
'moving' indicates an anagram (letters are moved around).
'act'+'shy'='actshy'
'actshy' is an anagram of 'YACHTS'.
'around' acts as a link.
(Other definitions for yachts that I've seen before include "Sailing boats" , "Sailing vessels" , "Expensive cruising vessels" , "Craft for 6 dn" , "Vessels propelled by sail or power" .)