Brother with beard displaying strength (5)
I believe the answer is:
brawn
'strength' is the definition.
(I know that brawn is a type of strength)
'brother with beard' is the wordplay.
'brother' becomes 'br' (abbreviation in titles of monks).
'with' says to put letters next to each other.
'beard' becomes 'awn' (both can mean a growth on plants).
'br'+'awn'='BRAWN'
'displaying' is the link.
(Other definitions for brawn that I've seen before include "Beefiness" , "perhaps, a sandwich filling" , "Pressed cooked meat; strength" , "Physical strength; cooked meat" , "Jellied meat - muscle" .)