A sweep, for instance, with love and a warm heart (3)
I believe the answer is:
oar
'a sweep' is the definition.
(I've seen this in another clue)
'love and a warm heart' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'and' is a charade indicator (letters next to each other).
'heart' says to take the centre.
The centre of 'warm' is 'ar'.
'o'+'ar'='OAR'
'for instance with' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for oar that I've seen before include "Rower's flat blade" , "Propelling blade" , "Crewman" , "Use it to move a boat" , "It ends in blade" .)