Sounds feeble for a few days (4)
I believe the answer is:
week
'a few days' is the definition.
(seven days)
'sounds feeble' is the wordplay.
'sounds' 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 "Calendar period" , "Seven days" , "Part of the year" , "Period of time; sounds like feeble" , "Seven day period" .)