Approximately the combined weight of Tory voters in 1983 returning Thatcher? (8)
I believe the answer is:
teragram
'approximately the combined weight of tory voters in 1983' is the definition.
(several million people might weigh a teragram)
'returning thatcher?' is the wordplay.
'returning' is a reversal indicator.
'thatcher?' becomes 'margaret' (prime minister Margaret Thatcher).
'margaret' in reverse letter order is 'TERAGRAM'.
I've seen this clue in The Independent.
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