Sound feeble for a few days (4)
I believe the answer is:
week
'a few days' is the definition.
(a week is 7 days)
'sound feeble' is the wordplay.
'sound' indicates a 'sounds like' (homophone) clue.
'feeble' becomes 'weak' (similar in meaning).
'weak' sounds like 'WEEK'.
'for' acts as a link.
(Other definitions for week that I've seen before include "A long time in politics?" , "Seven day period" , "Seven days" , "Period of time; sounds like feeble" , "Part of the year" .)