Cryptic crossword clue
Rum served with forms of ice cream in Cranks 8

The most common and most likely answer to this crossword clue is the 8 letter word ODDBALLS

I've seen this crossword clue in Financial Times
O
D
D
B
A
L
L
S

Buddy explains!

The straight part
We know that "Cranks" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cranks = oddballs.
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 ODDBALLS mean?

ODDBALLS noun
  1. An eccentric or unusual person.
  2. A deviant stimulus that appears among repetitive stimuli during an experiment, to trigger an event-related potential in the participant.

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