Tie the knot after most excellent love is given (8)
I believe the answer is:
bestowed
'is given' is the definition.
(similar in meaning)
'tie the knot after most excellent love' is the wordplay.
'tie the knot' becomes 'wed' (to tie the knot can mean to marry).
'after' says to put letters next to each other.
'most excellent' becomes 'best' (I've seen this before).
'love' becomes 'o' (In tennis, 'love' means 'zero').
'best'+'o'='besto'
'wed' after 'besto' is 'BESTOWED'.
(Other definitions for bestowed that I've seen before include "Conferred" , "Given as a gift" , "Gave; presented" , "Granted" .)