Tender assassin? (5)
I believe the answer is:
offer
I believe this clue is a double definition.
'tender' is the first definition.
(synonyms)
'assassin?' is the second definition.
(someone who 'offs' people)
(Other definitions for offer that I've seen before include "Volunteer, present" , "Suggest" , "Volunteer -- proposal" , "Proposal (of marriage)" , "Provide (an opportunity)" .)