Not refreshments, one observes (7)
I believe the answer is:
notices
'one observes' is the definition.
(I've seen this before)
'not refreshments' is the wordplay.
'refreshments' becomes 'ices' (an ice or ice cream is a type of refreshment).
'not'+'ices'='NOTICES'
(Other definitions for notices that I've seen before include "Posters; sees" , "Sees; adverts" , "Perceives, sees" , "Remarks upon publicly displayed informations" , "Observers in section" .)