Vulnerable, sensitive (6)
I believe the answer is:
tender
I believe this clue is a double definition.
'vulnerable' is the first definition.
(synonyms)
'sensitive' is the second definition.
(I know that sensitive can be written as tender)
(Other definitions for tender that I've seen before include "Gentle, not tough" , "Bid, may be sealed" , "Offer, gentle, boat" , "easily damaged" , "Legal ..., official money" .)