An old Latvian allowed to be heard (4)

I believe the answer is:

lett

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'an old latvian' is the definition.
'Lett' can be an answer for 'latvian' (I've seen this in another clue). I'm not certain of the 'an old' bit.

'allowed to be heard' is the wordplay.
'allowed to' becomes 'let' (to let something happen is to allow it).
'be heard' becomes 't' (I am not sure about this - if you are sure you should believe this answer much more).
'let'+'t'='LETT'

Can you help me to learn more?

(Other definitions for lett that I've seen before include "Balt" , "Baltic citizen" , "East European" , "northerner" , "Native of Latvia" .)

I've seen this clue in the Evening Standard.

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