Old sultan dropping in for fresh food (5)
I believe the answer is:
salad
'fresh food' is the definition.
'salad' can be an answer for 'food' (salad is a type of food). I am unsure of the 'fresh' bit.
'old sultan dropping in' is the wordplay.
'old sultan' becomes 'saladin' (I've seen this before).
'dropping' indicates named letters should be taken away.
'saladin' with 'in' taken out is 'SALAD'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for salad that I've seen before include "Cold dish of veg and herbs" , "Mainly raw cold dish" , "healthy food" , "Raw greens, mainly" , "Counter serving cold vegetable dishes" .)