Crossword Genius

Fast tango and light dancing with unknown character (7)

Ross

I believe the answer is:

tightly

'fast' is the definition.
(fast can mean tightly or securely)

'tango and light dancing with unknown character' is the wordplay.
'tango' becomes 'T' (phonetic alphabet: alpha, bravo, charlie etc.).
'and' is a charade indicator (letters next to each other).
'dancing with' indicates anagramming the letters.
'unknown character' becomes 'y' (algebra).
'light' mixed up with 'y' gives 'ightly'.
't'+'ightly'='TIGHTLY'

(Other definitions for tightly that I've seen before include "Securely" , "In a close-fitting manner" .)

I've seen this clue in The Telegraph.
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