Crossword Genius

Couple in Glasgow starts to notice ghastly local intonation (5)

Ross

I believe the answer is:

twang

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'local intonation' is the definition.
(I've seen this before)

'couple in glasgow starts to notice ghastly' is the wordplay.
'couple in glasgow' becomes 'twa' (I can't justify this - if you can you should believe this answer much more).
'starts to' suggests taking the first letters.
The first letters of 'notice ghastly' is 'ng'.
'twa'+'ng'='TWANG'

Can you help me to learn more?

(Other definitions for twang that I've seen before include "Sound of elastic being plucked" , "Nasal quality - strumming noise" , "Plucking sound - nasal tone" , "nasal effect" , "Local accent" .)

I've seen this clue in The Independent.
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