As spy at GCHQ eats, twit occasionally drops food (9)

I believe the answer is:

spaghetti

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'drops food' is the definition.
'spaghetti' can be an answer for 'food' (spaghetti is a kind of food). I am not sure about the 'drops' bit.

'as spy at gchq eats twit occasionally' is the wordplay.
'occasionally' means one should take alternating letters.
'as'+'spy'+'at'+'gchq'+'eats'+'twit'='asspyatgchqeatstwit'
The alternate letters of 'asspyatgchqeatstwit' are 'SPAGHETTI'.

Can you help me to learn more?

(Other definitions for spaghetti that I've seen before include "Pasta twirled around a fork" , "Italian dish made from pasta, often Bolognese" , "something resembling tangled wires" , "The gas tip can produce a pasta" , "Type of pasta" .)

I've seen this clue in The Telegraph.

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