Spotted heavyweight rising, getting killed (7)
I believe the answer is:
noticed
'spotted' is the definition.
(I've seen this before)
'heavyweight rising getting killed' is the wordplay.
'heavyweight' becomes 'ton' (I've seen this before).
'rising' shows that the letters should be reversed in order (going up in a down clue).
'getting' means one lot of letters go next to another.
'killed' becomes 'iced' (I've seen this before).
'ton' back-to-front is 'not'.
'not'+'iced'='NOTICED'
(Other definitions for noticed that I've seen before include "Marked" , "Spotted" , "Seen" , "Perceived or observed" , "remarked" .)