Wild West tale half caught by a girl (7)
I believe the answer is:
lawless
'wild' is the definition.
(I've seen this in another clue)
'west tale half caught by a girl' is the wordplay.
'west' becomes 'W' (abbreviation).
'half' suggests halving the letters.
'caught by' indicates putting letters inside.
'a girl' becomes 'lass' (lass can informally mean a girl).
'tale' with half the letters taken is 'le'.
'w'+'le'='wle'
'wle' inserted inside 'lass' is 'LAWLESS'.
(Other definitions for lawless that I've seen before include "Slew Sal for being criminal" , "Anarchy" , "Ungoverned" , "Unruly - anarchic" , "insubordinate" .)