What does the cryptic crossword clue "Computer file appended to mail for researcher (7)" mean?

The definition is "researcher". The wordplay uses a charade (building blocks). POST (synonym="”mail” DOC can be short for “document” in general") + DOC (synonym="“Computer file”") = POSTDOC; definition: "researcher" The answer is POSTDOC.

Computer file appended to mail for researcher (7)

Guardian Cryptic #29480 | 9 Across | 2024-09-05 flower

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