Day is fairly empty for meet (7)
I believe the answer is:
satisfy
'for meet' is the definition.
(satisfying is a kind of meeting)
'day is fairly empty' is the wordplay.
'day' becomes 'sat' (abbreviation for Saturday).
'empty' means to remove the middle letters.
'fairly' with its centre taken out is 'fy'.
'sat'+'is'+'fy'='SATISFY'
(Other definitions for satisfy that I've seen before include "Fulfil, a desire or need" , "Quench, sate" , "Provide enough" , "pay in full" , "Be good enough for" .)