Archer has this desire to show reverence (7)
I believe the answer is:
longbow
'archer has this' is the definition.
(an archer might use a longbow)
'desire to show reverence' is the wordplay.
'desire' becomes 'long' (longing is a kind of desiring).
'to show reverence' becomes 'bow' (to bow to someone is to show reverence).
'long'+'bow'='LONGBOW'
(Other definitions for longbow that I've seen before include "Weapon shooting arrows" , "Medieval weapon" , "Decisive weapon at Agincourt" , "taken up by The Archers" , "Robin Hood's weapon" .)