Seaman sat playing in some water (6,3)
I believe the answer is:
tasman sea
'some water' is the definition.
(I've seen this before)
'seaman sat playing' is the wordplay.
'playing' indicates an anagram.
'seaman'+'sat'='seamansat'
'seamansat' is an anagram of 'TASMAN SEA'.
'in' is the link.
(Other definitions for tasman sea that I've seen before include "Place to sail far away" , "The main" , "Cook explored here" , "large quantity of water" , "Body of water separating Australia and New Zealand" .)