A letter or two from a girl (5)

I believe the answer is:

lorna

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'a girl' is the definition.

'a letter or two' is the wordplay.
'a letter' becomes 'l'.
'two' becomes 'na' (I can't explain this - if you can you should give a lot more credence to this answer).
'l'+'or'+'na'='LORNA'

'from' acts as a link.

Can you help me to learn more?

(Other definitions for lorna that I've seen before include "-- Doone (book)" , "-- Doone, novel" , "Female" , "and 21 Down: Novel by R.D. Blackmore" , "girl" .)

I've seen this clue in the Evening Standard.

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