Dialect using two letters or three (7)

I believe the answer is:

geordie

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

'two letters or three' is the wordplay.
'two letters' can mean two substitutions for 'letter'.
'letter' becomes 'g'.
'letter' becomes 'e'.
'three' becomes 'die' (I am not sure about this - if you are sure you should believe this answer much more).
'g'+'e'+'or'+'die'='GEORDIE'

'using' acts as a link.

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(Other definitions for geordie that I've seen before include "Newcastle-upon-Tyne native" , "Northern chap" , "Native of Newcastle" , "Someone from Newcastle-upon-Tyne" , "Person from Newcastle-upon-Tyne?" .)

I've seen this clue in the Evening Standard.

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