Superb hair bow king jettisoned before church (3,5)
I believe the answer is:
top-notch
'superb' is the definition.
(I've seen this before)
'hair bow king jettisoned before church' is the subsidiary indication.
'hair bow' becomes 'topknot'.
'king' becomes 'k'.
'jettisoned' suggests deleting specific letters.
'before' means one lot of letters go next to another.
'church' becomes 'ch' (common abbreviation).
'topknot' with 'k' removed is 'topnot'.
'topnot'+'ch'='topnotch'
(Other definitions for top-notch that I've seen before include "Excellent (informal)" , "First-rate" , "Superb" , "Of the highest quality" , "Grade 1" .)