Lacking will, belonging to trial rowing team, one hears (9)
I believe the answer is:
intestate
'lacking will' is the definition.
'belonging to trial rowing team one hears' is the wordplay.
'belonging to' becomes 'in' (I've seen this in other clues).
'trial' becomes 'test' (synonyms).
'rowing team' becomes 'eight' (eight rowers).
'one hears' indicates a 'sounds like' (homophone) clue (I've seen 'heard of' mean this).
'eight' sounds like 'ate'.
'in'+'test'+'ate'='INTESTATE'
(Other definitions for intestate that I've seen before include "Unwilling" , "Dying thus, one leaves no will" , "One without will" , "Not having written a will before death" , "Passing on without leaving a will" .)