Press hack in loco? (4,5)
I believe the answer is:
iron horse
'loco?' is the definition.
(I've seen this before)
'press hack' is the wordplay.
'press' becomes 'iron' (ironing is a kind of pressing).
'hack' becomes 'horse' (I can't justify this - if you can you should give a lot more credence to this answer).
'iron'+'horse'='IRON HORSE'
'in' is the link.
Can you help me to learn more?
(Other definitions for iron horse that I've seen before include "Steam locomotive" , "worn-out engine" , "loco" , "An invention of the steam age" , "People made tracks for this!" .)