Union leader caught in women's clothing gets imprisonment (6)
I believe the answer is:
duress
'imprisonment' is the definition.
(thesaurus)
'union leader caught in women's clothing' is the wordplay.
'union leader' becomes 'ures' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'caught in' indicates putting letters inside.
'women' becomes 'debs' (deb is a kind of woman).
'clothing' suggests removing the centre.
'debs' with its centre removed is 'ds'.
'ures' going inside 'ds' is 'DURESS'.
'gets' is the link.
Can you help me to learn more?
(Other definitions for duress that I've seen before include "Compulsion by use of force" , "Restraint" , "Hardship" , "Constraint, coercion" , "Coercion, pressure" .)