They established institutions in which orphan forgets trace of lost parents (8,7)

I believe the answer is:

founding fathers

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'they established institutions in which orphan forgets trace' is the definition.
The definition suggests an adverb but the answer is not.

'lost parents' is the wordplay.
'lost' becomes 'founding' (I am not sure about this - if you are sure you should believe this answer much more).
'parents' becomes 'fathers' (father is a kind of parent).
'founding'+'fathers'='FOUNDING FATHERS'

'of' acts as a link.

Can you help me to learn more?

(Another definition for founding fathers that I've seen is " Pioneers".)

I've seen this clue in The Guardian.

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