Acquiring clothes which you also need to take off (7,4)
I believe the answer is:
landing gear
'acquiring clothes which you also need to take off' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'acquiring clothes' is the wordplay.
'acquiring' becomes 'landing' (I can't justify this - if you can you should give a lot more credence to this answer).
'clothes' becomes 'gear' (I've seen this before).
'landing'+'gear'='LANDING-GEAR'
Can you help me to learn more?
(Other definitions for landing gear that I've seen before include "Aircraft undercarriage" , "Aircraft's undercarriage" , "may be seen coming down to earth after flight" , "It gets you down in the end" , "Plane's undercarriage" .)