Eliminate in heats, and round following (3,4,2)
I believe the answer is:
get shot of
'eliminate' is the definition.
(I've seen this before)
'heats and round following' is the wordplay.
'heats' becomes 'getshot' ('get hot' can be a synonym of 'heat').
'and' is a charade indicator (letters next to each other).
'round' becomes 'o' (round can mean a round object).
'following' becomes 'f' (used when citing page numbers etc**).
'getshot'+'o'+'f'='GET SHOT OF'
'in' acts as a link.
(Other definitions for get shot of that I've seen before include "Kick" , "Manage to photograph" , "Eliminate" , "ditch?" .)