Coming down with equipment for undercarriage (7,4)
I believe the answer is:
landing gear
'undercarriage' is the definition.
(landing gear is a kind of undercarriage)
'coming down with equipment' is the wordplay.
'coming down' becomes 'landing' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'equipment' becomes 'gear' (gear is a kind of equipment**).
'landing'+'gear'='LANDING-GEAR'
'for' is the link.
(Other definitions for landing gear that I've seen before include "Plane's undercarriage" , "It gets you down in the end" , "Aircraft's undercarriage" , "Aircraft undercarriage" , "may be seen coming down to earth after flight" .)