Energy negotiations can be rallying cries (3,5)
I believe the answer is:
pep talks
'be rallying cries' is the definition.
'energy negotiations' is the wordplay.
'energy' becomes 'pep' (personal energy, vim).
'negotiations' becomes 'talks' (I've seen this before).
'pep'+'talks'='PEP TALKS'
'can' acts as a link.
(Other definitions for pep talks that I've seen before include "Homilies urging more spirit and effort" , "Homilies urging listeners to greater evergy or action" , "Speeches to instil enthusiasm" , "Morale-boosters" , "Inspiring speeches" .)