Fare goes down here, so I hope, when flying, to save a grand (9)
I believe the answer is:
oesophagi
'fare goes down here' is the definition.
(food or 'fare' goes down an oesophagus)
'so i hope when flying to save a grand' is the wordplay.
'when flying' is an anagram indicator (letters fly around).
'to save' indicates putting letters inside.
'grand' becomes 'g' ('G' can be a synonym of 'grand').
'so'+'i'+'hope'='soihope'
'soihope' with letters rearranged gives 'oesophi'.
'a'+'g'='ag'
'oesophi' placed around 'ag' is 'OESOPHAGI'.
(Other definitions for oesophagi that I've seen before include "What act as channels" , "pipes" , "parts of canals" , "inner tubes" , "Crops" .)