Tango led by topless paramour in public (5)
I believe the answer is:
overt
'in public' is the definition.
(I've seen this before)
'tango led by topless paramour' is the wordplay.
'tango' becomes 'T' (phonetic alphabet: alpha, bravo, charlie etc.).
'led by' means one lot of letters go next to another.
'topless' means to remove the first letter.
'paramour' becomes 'lover' (I've seen this before).
'lover' with its first letter removed is 'over'.
't' after 'over' is 'OVERT'.
(Other definitions for overt that I've seen before include "This is not hard to see" , "Open, not secret or hidden" , "Explicit" , "Open and candid" , "Open and undisguised" .)