Stars love hard-boiled film genre retrospective (5)
I believe the answer is:
orion
'stars' is the definition.
(Orion is a constellation)
'love hard-boiled film genre retrospective' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'hard-boiled film genre' becomes 'noir' (I've seen this in another clue).
'retrospective' is a reversal indicator.
'noir' back-to-front is 'rion'.
'o'+'rion'='ORION'
(Other definitions for orion that I've seen before include "Constellation in the form of a belt" , "Prominent constellation" , "Constellation with seven bright stars" , "Star" , "Mythical Greek hunter turned into constellation" .)