A meal with a companion can be instructive (5)

I believe the answer is:

teach

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'be instructive' is the definition.
I can't tell whether this definition defines the answer.

'a meal with a companion' is the wordplay.
'a meal' becomes 'tea' (tea is a type of meal).
'with' is a charade indicator (letters next to each other).
'a companion' becomes 'ch' (Companion of Honour).
'tea'+'ch'='TEACH'

'can' acts as a link.

Can you help me to learn more?

(Other definitions for teach that I've seen before include "Act as director" , "Work in school" , "Convey knowledge to students" , "Coach" , "Cheat (anag)" .)

I've seen this clue in the Evening Standard.

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