Likely person’s taken unawares and worried (9)
I believe the answer is:
candidate
'likely person's' is the definition.
'candidate' can be an answer for 'person's' (candidate is a kind of person). I am unsure of the 'likely' bit.
'unawares and worried' is the wordplay.
'unawares' becomes 'candid' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' says to put letters next to each other.
'worried' becomes 'ate' (something worrying may eat someone up).
'candid'+'ate'='CANDIDATE'
'taken' acts as a link.
Can you help me to learn more?
(Other definitions for candidate that I've seen before include "One hoping to be chosen" , "One standing for office" , "one seeking election" , "Applicant, nominee 99)" , "who tries to get elected?" .)