Sees a shop opening, having food (5)

I believe the answer is:

spies

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'sees a shop opening having food' is the definition.
I can't judge whether this definition defines the answer.

'sees a shop opening having food' is the wordplay.
'opening' says to take the initial letters.
'having' is an insertion indicator.
'food' becomes 'pie' (pie is a kind of food).
The first letters of 'sees shop' is 'ss'.
'ss' placed around 'pie' is 'SPIES'.

Can you help me to learn more?

(Other definitions for spies that I've seen before include "Snoops" , "Double agents" , "Secret agents" , "Eg, CIA" , "Undercover agents" .)

I've seen this clue in the Evening Standard.

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