Oxfam, Unicef etc (8)

I believe the answer is:

acronyms

(Other definitions for acronyms that I've seen before include "Words made from first letters of other words" , "Words made from the initials of others" , "NICAM and the like" , "Words formed from the initials of others" , "entities formed initially, one can say" .)

I've seen this clue in The Times and The Sunday Times.

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