Warm through hearts and enjoy meal (4)
I believe the answer is:
heat
'warm' is the definition.
(thesaurus)
'hearts and enjoy meal' is the wordplay.
'hearts' becomes 'h' (abbreviation used in card games e.g. bridge).
'and' means one lot of letters go next to another.
'enjoy meal' becomes 'eat' (I am not sure about this - if you are sure you should believe this answer much more).
'h'+'eat'='HEAT'
'through' acts as a link.
Can you help me to learn more?
(Other definitions for heat that I've seen before include "Energy that causes a rise in temperature" , "Warm up" , "brings out a sweat?" , "Raise temperature" , "High temperature" .)