Notice! He has, and I have some small gums (9)

I believe the answer is:

adhesives

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'gums' is the definition.
The definition and answer can be both substances as well as being plural nouns.
Perhaps they are linked in a way I don't understand?

'notice he has and i have some small' is the wordplay.
'notice' becomes 'ad' (both can mean an advertisement).
'he has' becomes 'hes' (he's).
'and' is a charade indicator (letters next to each other).
'i have' becomes 'i've'.
'some small' becomes 's' (abbreviation - e.g. clothes size).
'ad'+'hes'+'ive'+'s'='ADHESIVES'

Can you help me to learn more?

I've seen this clue in The Hindu.

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