Sole highwayman? (7)
I believe the answer is:
footpad
'sole highwayman?' is the definition.
'footpad' can be an answer for 'highwayman?' (I've seen this in another clue). I'm not sure about the 'sole' bit.
'sole highwayman?' is the wordplay.
'sole' becomes 'foot' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'highwayman?' becomes 'pad' (I've seen this in another clue).
'foot'+'pad'='FOOTPAD'
Can you help me to learn more?
(Other definitions for footpad that I've seen before include "Mugger of old" , "Highwayman without a horse" , "Old robber" , "thief?" , "Old-style robber" .)