Wake hurriedly and set out to be most feeble (7)
I believe the answer is:
weakest
'be most feeble' is the definition.
('weak' can be a synonym of 'feeble')
'wake hurriedly and set out' is the wordplay.
'wake hurriedly' becomes 'weak' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'set' anagrammed gives 'est'.
'weak'+'est'='WEAKEST'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for weakest that I've seen before include "Having minimum power" , "Least powerful" , "Least strong" , "like some television links?" .)