Sniper who shot one with floating assets? (9)
I believe the answer is:
shipowner
'one with floating assets?' is the definition.
'sniper who shot' is the wordplay.
'shot' indicates anagramming the letters.
'sniper'+'who'='sniperwho'
'sniperwho' anagrammed gives 'SHIPOWNER'.
(Other definitions for shipowner that I've seen before include "I've secured brig" , "Crafty proprietor" , "Onassis, say" , "man over the line" .)