What does the cryptic crossword clue "Labour on retrospective cover-up (7)" mean?

The definition is "cover-up". The wordplay uses charade, reversal. SWEAT (synonym of "Labour") + RE (synonym of "on") [reversal: "retrospective"]; definition: "cover-up" The answer is SWEATER.

Labour on retrospective cover-up (7)

Guardian Cryptic #29071 | 18 Across | 2023-05-16 flower

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