Footballers must have it on hospital trust (5)
I believe the answer is:
faith
'trust' is the definition.
(synonyms)
'footballers must have it on hospital' is the wordplay.
'footballers' becomes 'fa' (Football Association abbreviation).
'must have' is a charade indicator (letters next to each other).
'on' says to put letters next to each other.
'hospital' becomes 'h'.
'fa'+'it'+'h'='FAITH'
(Other definitions for faith that I've seen before include "Strong belief in a supernatural power" , "Staunch trust" , "Unshakeable belief" , "A woman" , "Trust in someone" .)