Read out correct inside, although one might tweak it (8)
I believe the answer is:
adjuster
'read out correct inside although one might' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'tweak it' is the wordplay.
'tweak' becomes 'adjust' (I've seen this in another clue).
'it' becomes 'er' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'adjust'+'er'='ADJUSTER'
Can you help me to learn more?
(Other definitions for adjuster that I've seen before include "One tweaks" , "Regulator" , "I'll change" , "One slightly altering" , "One makes tiny reforms" .)