Tango was important, leaving maiden worn out (8)
I believe the answer is:
tattered
'worn out' is the definition.
(tattered means worn out or in poor condition)
'tango was important leaving maiden' is the wordplay.
'tango' becomes 'T' (phonetic alphabet: alpha, bravo, charlie etc.).
'was important' becomes 'mattered' (to matter is to be important).
'leaving' is a deletion indicator.
'maiden' becomes 'm' (cricket abbreviation).
'mattered' with 'm' removed is 'attered'.
't'+'attered'='TATTERED'
(Other definitions for tattered that I've seen before include "Shabby" , "Torn into irregular pieces" , "Torn and ragged" , "Torn irregularly like scarecrow's clothes" , "Worn to shreds" .)