Group of stars having duck and port with knight (5)
I believe the answer is:
orion
'group of stars' is the definition.
(I know that Orion is a constellation)
'duck and port with knight' is the wordplay.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'and' says to put letters next to each other.
'port' becomes 'rio' (Rio de Janeiro is a port).
'with' says to put letters next to each other.
'knight' becomes 'n' (chess abbreviation).
'o'+'rio'+'n'='ORION'
'having' is the link.
(Other definitions for orion that I've seen before include "Belted constellation" , "Bright constellation, named after legendary Greek hunter" , "His belt is in the heavens" , "Group of stars" , "He hunted" .)