Set out with a warm-hearted beam (5)
I believe the answer is:
array
'set out' is the definition.
(synonyms)
'with a warm-hearted beam' is the wordplay.
'with' means one lot of letters go next to another.
'hearted' indicates the central letters.
'beam' becomes 'ray' (synonyms).
The centre of 'warm' is 'ar'.
'ar' next to 'ray' is 'ARRAY'.
(Other definitions for array that I've seen before include "dress" , "Ordered arrangement (of troops)" , "Impressive display; matrix" , "Significant arrangement" , "Rig up" .)