Crossword Genius

Start-up chat line problematic and improper (9)

Ross

I believe the answer is:

unethical

I'm a little stuck... Click here to teach me more about this clue!

'improper' is the definition.
Both the answer and definition are adjectives. Perhaps you can see an association between them that I don't see?

'start-up chat line problematic' is the wordplay.
'start' means to remove the last letter (I've seen 'starts' mean this).
'problematic' is an anagram indicator.
'up' with its last letter removed is 'u'.
'chat'+'line'='chatline'
'chatline' with letters rearranged gives 'nethical'.
'u'+'nethical'='UNETHICAL'

'and' is the link.

Can you help me to learn more?

(Other definitions for unethical that I've seen before include "Unscrupulous in business or professional conduct" , "Shady" , "Morally wrong" , "Not conforming to moral standards" , "Wrong, immoral" .)

I've seen this clue in The Irish Times.
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