Old soldier in women's clothes? With nothing on! (7)
I believe the answer is:
dragoon
'old soldier' is the definition.
'dragoon' can be an answer for 'soldier' (dragoon is a kind of soldier). I am unsure of the 'old' bit.
'women's clothes? with nothing on' is the wordplay.
'women's clothes?' becomes 'drag' (I can't explain this - if you can you should give a lot more credence to this answer).
'with' means one lot of letters go next to another.
'nothing' becomes 'O' (looks like zero - 0).
'drag'+'o'+'on'='DRAGOON'
'in' is the link.
Can you help me to learn more?
(Other definitions for dragoon that I've seen before include "Coerce someone to do something against their will" , "[CARIBINEER]?" , "Press" , "Coerce; mounted soldier" , "Harass" .)