Listing Roger and Stacy exposed to me? (12)

I believe the answer is:
categorising
'listing' is the definition.
Both the definition and answer are present participle verbs.
Perhaps there's a link between them I don't understand?
'roger and stacy exposed to me?' is the wordplay.
I cannot really see how this works, but
'roger' could be 'r' (abbreviation used in radio communications) and 'r' is located in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
'me?' could be 'i' and 'i' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
I've seen this clue in The Independent.
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