Passionate warden released women to tango (6)
I believe the answer is:
ardent
'passionate' is the definition.
(similar in meaning)
'warden released women to tango' is the wordplay.
'released' is a deletion indicator (deleted letters are released or sent out).
'women' becomes 'w' (standard abbreviation).
'to tango' becomes 'T' (phonetic alphabet: alpha, bravo, charlie etc.).
'warden' with 'w' taken out is 'arden'.
'arden'+'t'='ARDENT'
(Other definitions for ardent that I've seen before include "Enthusiastic, eager" , "Ranted, being passionate" , "Burning with emotion" , "Warm and loving" , "Passionate, fervent" .)