Lowdown on the team's spirits (5)
I believe the answer is:
genii
'spirits' is the definition.
(plural of genie or genius)
'lowdown on the team's' is the wordplay.
'lowdown' becomes 'gen' (gen can informally mean information).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'the team' becomes 'ii'.
'gen'+'ii'='GENII'
(Other definitions for genii that I've seen before include "Demons with magical powers" , "bottled spirits" , "masterminds" , "Guardian spirits of a place" , "Arabian spirits" .)