Clue: Blast, say, dynamite left by sailor around vacated emplacement (9)
Answer: EXPLETIVE
Explanation: Definition: Blast, say
EXPLOSIVE ('dynamite' – 'say' doubles here and the definition) minus (if it seems the wrong way round – "the meeting was left by several people") OS ('sailor') and replaced by ET ('vacated **E**mploymen**T**'), with a suitably mild example in place of definition.