Try out poor tea with a will (7)
I believe the answer is:
testate
'with a will' is the definition.
(I've seen this before)
'try out poor tea' is the wordplay.
'try out' becomes 'test' (synonyms).
'poor' indicates an anagram.
'tea' is an anagram of 'ate'.
'test'+'ate'='TESTATE'
(Other definitions for testate that I've seen before include "Having made a will before death" , "With a legally valid will" , "Having made a valid will" , "Having made a last will and testament" , "Having left a legacy" .)