A pass yet to be constructed for assistant (7)
I believe the answer is:
acolyte
'assistant' is the definition.
(acolyte is a kind of assistant)
'a pass yet to be constructed' is the wordplay.
'pass' becomes 'col' (col is a kind of pass**).
'to be constructed' indicates anagramming the letters.
'yet' with letters rearranged gives 'yte'.
'a'+'col'+'yte'='ACOLYTE'
'for' acts as a link.
(Other definitions for acolyte that I've seen before include "Altar boy" , "trainee" , "Lace toy (anag.)" , "Priest's assistant at a liturgical service" , "Attendant - faithful follower" .)