Stars in the old town playing around on rank (4,5)
I believe the answer is:
ursa major
'stars in the old town' is the definition.
'ursa major' can be an answer for 'stars' (I've seen this before). I am not sure about the 'in the old town' bit.
'playing around on rank' is the wordplay.
'playing around' becomes 'ursa' (I am not sure about this - if you are sure you should believe this answer much more).
'on' means one lot of letters go next to another (in a down clue, letters appear on others).
'rank' becomes 'major' (military rank).
'ursa'+'major'='URSA MAJOR'
Can you help me to learn more?
(Other definitions for ursa major that I've seen before include "Great Bear constellation" , "Big Dipper (Lat.)" , "Constellation containing the Plough" , "Group of stars" .)