A letter or two from a low-down dog (5)

I believe the answer is:

corgi

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'dog' is the definition.
(I know that corgi is a type of dog)

'a letter or two from a low-down' is the wordplay.
'a letter' becomes 'c'.
'two from a low-down' becomes 'gi' (I can't justify this - if you can you should give a lot more credence to this answer).
'c'+'or'+'gi'='CORGI'

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(Other definitions for corgi that I've seen before include "Welsh 11" , "Royal pet" , "pet in 9 [CARDIFF]?" , "man's best friend" , "found in the kennels" .)

I've seen this clue in the Evening Standard.

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