Passage from service after hollow invocation (5)
I believe the answer is:
inlet
'passage' is the definition.
(I've seen this before)
'service after hollow invocation' is the wordplay.
'service' becomes 'let' (type of tennis serve).
'after' is a charade indicator (letters next to each other).
'hollow' means to remove the middle letters (the word is hollowed out).
'invocation' with its middle removed is 'in'.
'let' after 'in' is 'INLET'.
'from' acts as a link.
(Other definitions for inlet that I've seen before include "Means of entry" , "Small area of sea" , "Small opening of coastline" , "bit of a lake here?" , "Gulf" .)