No agreement turned up? Curious (5)
I believe the answer is:
nosey
'curious' is the definition.
('nosey' can be similar in meaning to 'curious')
'no agreement turned up?' is the wordplay.
'agreement' becomes 'yes'.
'turned up?' says the letters should be written backwards.
'yes' written backwards gives 'sey'.
'no'+'sey'='NOSEY'
(Other definitions for nosey that I've seen before include "Showing too much interest in other people's affairs" , "Offensively curious or inquisitive" , "Impertinent" , "Prying" , "Curious in nasal way" .)