Those people have energy for motif (5)
I believe the answer is:
theme
'motif' is the definition.
('theme' can be a synonym of 'motif')
'those people have energy' is the wordplay.
'those people' becomes 'them' (I've seen this before).
'have' means one lot of letters go next to another.
'energy' becomes 'e' (physics symbol as in E=mc2).
'them'+'e'='THEME'
'for' is the link.
(Other definitions for theme that I've seen before include "[(type of) PARK]" , "Unifying motif" , "Short melody" , "Burden" , "Subject matter, motif" .)