Port deprived of five hundred and six deliveries? (4)
I believe the answer is:
over
'six deliveries?' is the definition.
(cricket term)
'port deprived of five hundred' is the wordplay.
'port' becomes 'dover' (I've seen this before).
'deprived of' is a deletion indicator.
'five hundred' becomes 'd' (synonyms).
'dover' with 'd' taken out is 'OVER'.
'and' is the link.
(Other definitions for over that I've seen before include "Beyond; finished" , "See 12" , "Round of six bowls in cricket - then it's finished" , "Directly above" , "The delivery is concluded" .)