The answer to each clue is a 3-, 6-, or 9-letter word. If you split these into 3-letter chunks, you will find 20 different ‘triples’ each appearing twice.

For example if one answer was ‘bellow’ then ‘bel’ and ‘low’ would appear somewhere else too, for instance in ‘disbelief’ and ‘lowest’, but then ‘dis’, ‘ief’ and ‘est’ would have to appear somewhere else too, etc, until all triples have appeared exactly twice.

100% probability

A group of related objects

A mongrel dog

Bunk or flower?

Chicken leg used in percussion?

Conducted or escorted

Corruptly paid money

Cut short

Dictionary of synonyms

Fourfold

Lots

More repulsive

Old name for Sulphur

Recite or chant in monotone

Reddish brown apple colour

Slang for a police officer

Small plate for a kitten's milk

The definite article

Whimsical

Xerox machine