1 across
‘Fish’,
‘good’,
‘bash’
–
one
of
those
four-letter
words
(9)
‘Fish’, ‘good’, ‘bash’ – one of those four-letter words (9)
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The definition is at the end of the clue.
How the clue works
The answer one of those four-letter words is a tetragram, built as a charade. Take TETRA (a 'fish' commonly kept in aquaria), add G (abbreviation for 'good'), then finish with RAM (to 'bash'), and you've assembled TETRAGRAM.