Where you might see the price of delivering landing gear (13)
I believe the answer is:
undercarriage
'landing gear' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for undercarriage that I've seen before include "part of plane" , "part of the aircraft" , "Aircraft's landing gear" , "(Aircraft) landing gear" , "Aircraft support" .)