Steadiness of British fellow supported by Anglican church (7)
I believe the answer is:
balance
'steadiness' is the definition.
(thesaurus)
'british fellow supported by anglican church' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'fellow' becomes 'alan' (**).
'supported by' is a charade indicator (letters next to each other) (letters go below - in down clue).
'anglican church' becomes 'ce' (Church of England).
'b'+'alan'+'ce'='BALANCE'
'of' acts as a link.
(Other definitions for balance that I've seen before include "State of equilibrium" , "Rest" , "Poise" , "Weighing apparatus" , "Cab lane (anag)" .)