Stars from Mourinho's last club possibly retiring (5)
I believe the answer is:
draco
'stars' is the definition.
(I know that Draco is a stars)
'mourinho's last club possibly retiring' is the wordplay.
'last' suggests the final letters.
'club possibly' becomes 'card' (clubs is a playing card suit).
'retiring' says the letters should be written backwards.
The last letter of 'mourinho' is 'o'.
'o'+'card'='ocard'
'ocard' written backwards gives 'DRACO'.
'from' acts as a link.
(Other definitions for draco that I've seen before include "Athenian statesman" , "Constellation, the Dragon" , "Harsh legislator" , "death-dealing lawman" , "Ruthless lawmaker" .)