Low-down on the team's spirits (5)
I believe the answer is:
genii
'spirits' is the definition.
(plural of genie or genius)
'low-down on the team's' is the wordplay.
'low down' becomes 'gen' (both can mean information).
'on' says to put 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 "Perhaps boy wonders" , "Clever people" , "Guiding spirits" , "Guardian spirits of a place" , "Spirits such as Aladdin's" .)