Spent seven days speaking (4)
I believe the answer is:
weak
'spent' is the definition.
(I've seen this before)
'seven days speaking' is the wordplay.
'seven days' becomes 'week' (I've seen this before).
'speaking' indicates a 'sounds like' (homophone) clue.
'week' sounds like 'WEAK'.
(Other definitions for weak that I've seen before include "Feeble or frail" , "Faint; frail" , "lacking intensity?" , "Lacking strength" , "Easily led" .)