Cryptic crossword clue
Support Labour — it’s a hard slog 7

The most common and most likely answer to this crossword clue is the 7 letter word LEGWORK

I've seen this crossword clue in The Daily Telegraph
L
E
G
W
O
R
K

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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does LEGWORK mean?

LEGWORK noun
  1. Work, especially research or preparation, that involves significant walking, travel, or similar effort.
  2. Skillful or vigorous use of the legs, as in dance or sports.

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